Hell Alternate: The Brimstone Underworld
Fire and Brimstone; the Biblical symbols of the wrath of God upon the damned. This is what inspired me to make an Underworld alternate that focuses around sulfur and acid, darkness and torment, versus the existing Underworld which is themed almost exclusively around fire. You are about to delve into a horrific and twisted alternate to the infernal pits of Hell. Brace yourself, and enjoy the ride.
Environment
This Underworld would be composed much like Hell is know: an ashy wasteland occupied by structures and dotted with special ore-like stone. Hell towers will still spawn as they ordinarily do, populating the inner circles of the Underworld. However, you will not find lava in these caustic depths. Instead, you will encounter vast amounts of Acidic Water, which you'll need to become familiar with before proceeding. It is a nasty green substance which behaves exactly like Water, except dealing damage on contact and inflicting the Acid Debuff.
Acidic Water as a part of liquid merging it would simply behave like this:
- Any Water that dribbles down from above will be converted instantly into Acid. (Water becomes Acidic while in this area.)
- Acid coming into contact with Lava forms Obsidian.
- Acid coming into contact with Honey eliminates the Honey.
It is important to note that Lava will still be present deep underground on worlds with this Underworld alternate. Just not in the Hell layer.
Items
Brimstone
Direct alternate to Hellstone.
* Found throughout the Underworld.
* Releases a half-tile of Acid when mined in the Underworld.
* Can be smelted into bars at Sulforges with a 4:1 ratio. (No Obsidian involved.)
Sulforge
Direct alternate to Hellforges.
* Found throughout the Underworld within structures.
* Can be used to smelt Ores into Bars, including Brimstone and Hellstone.
* Can be used in place of Sulforges in the Adamantite/Titanium Forge recipes.
Brimstone Bar
Direct alternate to Hellstone Bars.
* Used to craft Brimstone equipment.
Recipe:
Brimstone (4)
@ a Sulforge.
Gloomstalk
Direct alternate to Firebossom.
* Used to craft potions.
Here's a highlighted version so you can see it if you have a dark background:
Gloomstalk Seeds
Direct alternate to Firebossom Seeds.
* Dropped by Gloomstalk when harvested in bloom.
Ghastfish
Direct alternate to Flarefin Koi.
* Consumable.
* Fished from Acidic Water with the Hotline Fishing Rod.
* Can be eaten to apply the Gas Stream buff for 1 minute at the expense of being inflicted with Acid for 5 seconds.
- This makes it useful on ordinary Hell worlds when fished out during
Acid Rain.
Flarefin Koi
* Consumable.
* Can be eaten to apply the Inferno buff for 1 minute at the expense of being inflicted with On Fire for 5 seconds.
- This makes it useful on Underworld alternate worlds when fished out form Lava lakes underground.
Potions
Gravitation Potion
Alternate Recipe:
Bottled Water
Gloomstalk
Deathweed
Blinkroot
Feather
Teleportation Potion
Alternate Recipe:
Bottled Water
Chaos Fish
Gloomstalk
Obsidian Skin Potion
* Given an optional alternate recipe to make Obsidifish useful on Underworld alternate worlds when fished out form Lava lakes underground.
Recipe:
Bottled Water
Obsidifish
Ether Potion
Indirect alternate to Obsidian Skin Potion.
* Grants "Ethereal" Buff for (up to) 3 minutes.
- Player cannot touch enemies while in this state.
- Replaces the Lava Charm bar with an Ether bar, which provides immunity to damage until emptied.
- Ether is depleted 10% every second while in contact with harmful substances (i.e. Lava, Acid, burning tiles).
- Ether is depleted 1% for every point of damage that would otherwise be sustained from attacks upon hit.
- Ether regenerates 10% every second, but regeneration is canceled for 3 seconds after being used.
- If Ether is ever exhausted, debuff is removed.
- Tooltip reads "Cannot damage or be damaged while ethereal."
Recipe:
Bottled Water
Gloomstalk
Shiverthorn
Ghastream Potion
Direct alternate to Inferno Potion.
* Grants "Gas Stream" buff for 5 minutes, which causes a trail of acidic clouds to trail the player and damage enemies.
- Tooltip reads "Releasing a constant stream of noxious fumes" (lol)
Recipe:
Bottled Water
Ghastfish
Stinkfish
Gloomstalk
Crafted Equipment
Blighted Armor
Direct alternate to Molten Armor.
Blighted Helmet
7 Defense.
3% increased critical strike chance.
Recipe:
Brimstone Bars (10)
Blighted Breastplate
8 Defense.
5% increased Melee damage.
Recipe:
Brimstone Bars (20)
Blighted Greaves
7 Defense.
4% increased Melee damage.
2% increased critical strike chance.
Recipe:
Brimstone Bars (15)
Set Bonus: +5 Defense.
Full Set:
27 Defense
9% increased Melee damage.
5% increased critical strike chance.
The Blighted armor set provides more defense than Molten, but fewer net bonuses. It is also partially classless.
Recipe:
Brimstone Bars (45)
Sprite by @Brutallama
Caustic Claymore
'
Wrought from the purest brimstone.'
Direct alternate of the Fiery Greatsword.
* Less damaging, but faster.
Damage: 35
Use Time: 30 (2 uses/second)
Knockback: 6.5
* Inflicts Acid - 40% for 4 seconds.
Recipe:
Brimstone Bars (20)
@ an Anvil.
Plighted Pickaxe
'The earth yields to its unseen power.'
Direct alternate of the Molten Pickaxe.
* Mines slightly faster.
Damage: 15
Use Time: 23 (2.6 uses/second)
Knockback: 2
105% Pickaxe Power
* Inflicts Acid - 1/12 for 4 seconds.
Recipe:
Brimstone Bars (20)
@ an Anvil.
Brimstone Battleaxe
Semi-direct alternate to the Molten Hamaxe.
* Less powerful, but more rapid.
Damage: 25
Use Time: 28 (2.1 uses/second)
Knockback: 6.5
125% Axe Power
* Inflicts Acid - 1/6 for 4 seconds.
Recipe:
Brimstone Bars (15)
@ an Anvil.
Brimstone Basher
Semi-direct alternate to the Molten Hamaxe.
* Breaks walls faster.
Damage: 22
Use Time: 27 (2.1 uses/s)
Knockback: 6.5
75% Hammer Power
* Inflicts Acid - 1/6 for 4 seconds.
Recipe:
Brimstone Bars (15)
@ an Anvil.
Caustic Chakram
Direct alternate to the Flamarang.
'Callous as it is corrosive.'
* Stacks up to 3. (
Click for context)
Damage: 30
Use Time: 14 (4.3 uses/second)
Knockback: 8
* Inflicts Acid - 25% (1/4) for 4 seconds.
Recipe:
Thorn Chakram
Brimstone Bars (10)
@ an Anvil.
Sprite by @Brutallama
Hades Handcannon
Direct alternate to the Phoenix Blaster.
Damage: 30
Use Time: 13 (4.6 uses/second)
Knockback: 2.5
**If the Phoenix Blaster gets nerfed to make room for HM Ore Guns:
*Damage: 23
**If the Phoenix Blaster gains the ability to transform Musket Balls:
*Transforms fired Musket Balls into
Grim Shots.
Recipe:
Handgun
Brimstone Bars (10)
@ an Anvil.
Grim Arrow
Direct alternate to Hellfire Arrows.
* Gets infinite penetration for a brief moment after initial contact with an enemy.
* Inflicts Poison - 100% for 7 seconds.
Damage: 10
Velocity: 4.5
Recipe:
Wooden Arrows (25)
Brimstone Bar
@ an Anvil. Recipe makes 25.
Grim Shot
Direct alternate to
Hot Shots. (
See thread for details)
'Drains the target's vitality.'
Damage: 11
Velocity: 4
*Inflicts Poisoned - 50% for 7 seconds.
*Debuff can be inflicted on any enemy that is otherwise immune, excluding the Destroyer.
Recipe:
Musket Balls (70)
Brimstone Bar
@ an Anvil. Recipe makes 70.
Ghastly Bone Shard
Direct alternate to Broken Devil Wings.
* Used to craft Ghoul Wings.
Ghoul Wings
Direct alternate to Devil Wings.
Displayed on player.
Recipe:
Ghastly Bone Shard
Souls of Flight (20)
@ a Hardmode Anvil.
Looted Equipment
Soulfall Smasher
Direct alternate to the Sunfury.
* Flail-type Melee weapon.
Damage: 35
Use Time: 44 (1.4 uses/second)
Knockback: 8
* Inflicts Acid - 33% (1/3) for 4 seconds.
* Found in Shadow Chests in place of the Sunfury.
Corrosion
Alternate to Shadow Chest Magic weapons (Flower of Fire and Flamelash).
* Fires a bouncing Acid Bolt which bounces and penetrates enemies up to 5 times each.
Damage: 26
Use Time: 18 (3.3 uses/second)
Mana Cost: 11
Knockback: 5.5
Velocity: 6
* Inflicts Acid - 50% (1/2) for 4 seconds.
- Found in Shadow Chests in place of the Flower of Fire.
Soulcatcher Staff
Indirect alternate to the Imp Staff.
* Summons wrathful spirits to attack enemies.
* Follows a behaviors similar to Cursed Skulls, hovering and lingering around enemies before finally charging.
Damage: 22
Knockback: 2
Mana Cost: 10
Use Time: 35 (1.7 uses/second)
- Found in Shadow Chests in place of the Flamelash.
Sprite by @Brutallama
Sulfur Shard
Direct alternate to the Magma Stone.
* Imbues Melee attacks with Acid.
Dropped by:
Phantoms - 1% (1/100)
Tinkering:
Caustic Gauntlet
Direct alternate to the Fire Gauntlet with near-identical effects.
Recipe:
Sulfur Shard
Mechanical Glove
@ a Tinkerer's Workshop.
Modified version of a sprite by @ThatOneRobloxHater
Necrosis
'Casts a concentrated bolt of volatile energy.'
Direct alternate to Demon Scythes.
* Magic staff weapon.
Damage: 37
Use Time: 20 (3 uses/second)
Knockback: 0.5
* After hitting a target, it will trigger a delayed explosion which deals very small AoE damage (Exploding Bullet size) and inflict Acid for 4 seconds.
* Explosion is delayed by a half second.
Dropped by:
Garghouls - 2% (1/50)
Hellfury Staff
Direct alternate to the Unholy Trident.
'Wield the wrath of the damned.'
* Casts accelerating Hellfury Bolts. Explode upon penetration, dealing 50% extra damage over a very small area.
Damage: 72
Mana Cost: 11
Use Time: 27 (2.2 uses/second)
Dropped by:
Arch Ghouls - 3.33% (1/30)
Green Plumber's Outfit
Direct alternate to the Plumber's Outfit.
Hat - Dropped by Garghouls.
Shirt - Sold by the Clothier in place of the usual Plumber's Shirt.
Pants- Sold by the Clothier in place of the usual Plumber's Pants.
Enemies
Grime
Direct alternate to Lava Slimes.
* Larger and harder to kill, but slightly less damaging.
Health: 70
Defense: 12
Damage: 14
Drops:
Acid Slime Banner - 0.5% (1/200)
Phantom
Semi-direct alternate to Hellbats.
* Wraith enemy.
Health: 55
Defense: 6
Damage: 36
* Inflicts Darkness, 25% (1/4) for 15 seconds.
Drops:
Sulfur Shard - 0.1% (1/100)
Phantom Banner - 0.5% (1/200)
Bone Serpent
** Constant between standard Hell and this Underworld alternate.
* Worm AI enemy.
Health: 250
Defense: 10 (H) 12 (B) 18 (T)
Damage: 30 (H) 15 (B) 10 (T)
Drops:
Bone Serpent Banner - 0.5% (1/200)
Garghoul
Direct alternate to Demons.
Indirect alternate to Imps.
* Two-stage enemy. Starts off in an armored Statue form following basic Caster AI (like Imps), then switches to Demon AI in stage two.
* Fires high-velocity Necro Spheres at the Player in both stages, which deal 22 damage, inflict the Acid debuff for 5 seconds, and pass through walls.
Stage I:
Health: 210/210
Defense: 24
Contact damage: 17
* Fires Necro Spheres periodically (like Imps).
Stage II:
Health: 140/210
Defense: 12
Contact Damage: 35
* Fires Necro Spheres in bursts (like Demons).
Drops:
Necrosis - 2% (1/50)
Green Plumber's Cap - 0.4% (1/250)
Garghoul Banner - 0.5% (1/200)
Voodooghoul
Direct alternate to Voodoo Demons.
Health: 210
Defense: 12
Contact Damage: 35
* Fires Necro Spheres in bursts.
Drops:
Guide Voodoo Doll - 100% (Always)
Garghoul Banner - 0.5% (1/200)
Wraith
Indirect alternate to Lava Bats.
* Spawn in Hardmode.
* Inflicts the player with Slow - 12.5% (1/8) for 15 seconds.
Health: 160
Defense: 16
Damage: 65
Drops:
Fast Clock - 1% (1/100)
Wraith Banner - 0.5% (1/200)
Arch Ghoul
Direct alternate to Red Devils.
* Flying enemy.
* Spawn after a Mech has been defeated.
* Casts accelerating Hellstorm Bolts at the player in bursts, which deal 135 damage.
Health: 666
Defense: 40
Contact damage: 50
Drops:
Ghastly Bone Shard - 1.33% (1/75)
Garghoul Banner - 0.5% (1/200)

That was a lot of work... hopefully it was worth it.

Feedback is appreciated, so leave plenty of comments!
And now for the second part of this suggestion...
The Wall of Flesh is a terrifying creature, no one will deny that, but this caustic wasteland is no place for it. It is at home in Hell, which is alive with burning flames, monstrous demons, and a ghastly red atmosphere which it can blend into comfortably. In contrast, the dark, ominous, and sickly green of this nightmarish Underworld are more suited to a new, ghastlier creature.
Enter the Wall of Death. This is the monstrosity which would guard worlds with this Underworld alternate. Instead of eyes and a mouth which are reminiscent of the EoC, it has a skull and arms like a convoluted Skeletron. It would also rival the WoF in that it would be themed around the Corruption's rotten flesh over the Crimson's living flesh.
Wall of Death
"You have made a grave mistake."
Summoned by throwing a guide voodoo doll into acid in the Underworld.
The Wall of Death is infested by many smaller creatures. These 'Infestoids' stand in the place of the WoF's hungry and Leaches and are knocked off of the wall by hitting them. Unlike the hungry however, Infestoids are not easily removed from the wall. Upon killing one, it's head will fall off and form into its own monster, as either a digger or a fighter. The bad part though is that while the heads can be chopped off, the buds of the hives cannot be killed, instead sharing the health of the wall. after a while, a severed bud will form a new Infestoid, and the player will once again have to kill it.
If those are not enough to deal with on their own, there is the skull and hands as well, and they are not to be underestimated.
The Skull will stay facing forward, inactive for periods of time. But don't forget about it, because it will occasionally extend out on a long neck to head butt the player before returning to it's standard position. The Skull's other attack consists of it opening it's mouth, revealing another Infestoid in it's gaping maw, which would proceed to barf a spray of acid projectiles at the player, dealing damage and occasionally applying the acid debuff. The spray would consist of a large amount of projectiles of various sized (similar to Monstro's spit from 'the Binding of Isaac' for those familiar).
Now for the arms.
The Wall of Death has two arms which function as a combination of Skeletron's arms and Plantera's hooks. They will reach out and grab onto blocks, as if they are pulling the wall forward. Unlike Plantera's hooks however, they are made up from four sections -base, upper arm, forearm, and hand) rather than a chain and hook.
The Wall of Death will be a challenge, though it will be well worth the effort. With some cool new weapons as well. But before that, here are the stats.
The Skull
Max Life: 8200 (shared)
Defence: 0
Melee: 60
Ranged: 20-40 (depending on health)
Stays attached to the wall, ever facing dead ahead without waver. A picture is worth a thousand words, so both attacks have been illustrated here:
It's first attack consists of ramming forward at the player on a long chainlike neck, once it reaches the end of it's neck it will then retract back into it's position in the wall.
The Skull will also spit a spray of acidic projectiles when the player gets too close, similarly to Binding of Isaac's Monstro (
example).
The Tongue
New sprite when snared by the Wall of Death instead of the Wall of Flesh.
The Arms
Max Life: 8200 (Shared)
Defense: 18
Contact Damage: 30
* The two arms will simply reach forward, grab onto terrain, and pull the wall forward. They will tend to grab blocks near the player, so watch out.
Infestoid Hive
Health: 200
Defense: 10-40
Contact Damage: 25-80
* The Infestoid hives act differently from a hungry. Instead of extending and retracting on their vine, the Infestoids will instead be attached to their base by their chain as if it is a tether, they will float freely of it unless they pull too tightly. (For anyone who has seen a chain chomp, Infestoids would act much like that.) Their stats vary based on the Wall of Death's remaining health at the time they were spawned.
* Upon dying, their severed heads will drop and transform into one of two secondary forms. See details below.
Horrified
New tip when caused by the Wall of Death instead of the Wall of Flesh.
"You have made a grave mistake. There is no escape."
Monsters:
Infestoid (Digger)
Health: 85
Defense: 4
Damage: 22
* Spawns and expands to its full length after a severed head makes contact with the ground.
Drops:
Heart - 50% (1/2) when the player is damaged.
Infestoid (Spitter)
Health: 75
Defense: 6
Contact Damage: 28
Spit Damage: 22
* After materializing, it will follow a behavior similar to the Caster AI, except leaping in an arc to each new location instead of teleporting.
Drops:
Heart - 50% (1/2) when the player is damaged.
Drops:
The Bulwark
Elvish Strongbow
Sunder Sword
These three weapons would replace the Breaker Blade, Clockwork Assault Rifle, and Laser Rifle, respectively.
(Emblems and item drop rates are not mentioned here because of a supposed change to the WoF loot table in 1.3)
Altar Crusher - 100% (Always)
Replacement to the Pwnhammer.
See Milt69466's linked thread for details.
Healing Potions (5-15) - 100% (Always)
Wall of Death Trophy - 10% (1/10)
Wall of Death Mask - 14.3% (1/7)
Weapons:
Elvish Strongbow
* Ranged bow weapon. Uses arrows for ammo.
* Hold attack to increase power and greatly increase critical strike chance.
"Remnant of an ancient race."
Damage: 24-60
Use Time: 15+ (Up to 4 uses/second)
Knockback: 2-5
Velocity: 8-12
Critical Strike Chance: Up to +45%
* Takes one second to charge up to full power.
The Bulwark
* Melee flail-type ball and chain.
* A big-as-hell flail to take the place of a big-as-hell sword.
Damage: 42
Use Time: 44 (Very Slow)
Knockback: 7
* Obviously a lot more cumbersome than your ordinary flail. Bigger, and a bit more sluggish as well.
Sunder Sword
* Unique Magic weapon.
* Summons blade shards which orbit the player once before being flung towards the cursor.
"A blade fractured by strange magic."
Damage: 20
Use Time: 12 (5 uses/second)
Knockback: 1
* Hold attack to use, release attack to send all orbiting blades outward in a wide spread.
- Blades take two seconds to orbit, so the maximum number orbiting at once is 10 without modifiers.
Other Items:
Wall of Death Trophy
* Placeable 3x3 background tile.
Wall of Death Mask
* Vanity item.