Goomy
Skeletron Prime
More enemies should have expert mode only attacks and more enemies should inflict debuffs in expert mode.
Mother slimes spawn 3-4 baby slimes upon death instead of 1-3 and corrupt slimes spawn 4 slimelings upon death instead of 3.
All fighter AI skeletons throw bones instead of just normal cavern skeletons.
Snatchers, Man Eaters and Angry Trappers can lunge at you quickly and erratically. Angry Trappers can also spit seeds that inflict poison like those that Plantera shoots in phase 1.
Blazing wheels can inflict the On Fire! debuff.
Sharks can inflict bleeding.
Piranhas can inflict bleeding.
Wall creepers can spit web at you just like Black Recluses. The spit inflicts the Webbed debuff.
Blood Feeders can inflict bleeding.
Ghosts can inflict Weak.
Flying Snakes can inflict feral bite and venom.
Giant cursed skulls can inflict the cursed debuff. They should be able to inflict the cursed debuff in normal mode as well.
Lamias can inflict the cursed debuff.
Jungle Creepers can inflict venom and spit web at you that inflicts the Webbed debuff.
Phase 2 Wandering Eyes can ram the player like the Eye of Cthulhu does in phase 2.
Wandering Eyes can pass through blocks during blood moons.
Rainbow Slimes can inflict the confused debuff.
Green Jellyfish can inflict the Electrified debuff when they are electrified.
Clowns can sometimes spawn a Chattering Teeth Bomb. http://terraria.wiki.gg/Chattering_Teeth_Bomb
Ice Golems can Inflict Frostburn.
All three Frost Legion enemies can inflict the chilled debuff on contact.
Dr. ManFly's vials can inflict poison.
Drakanians and Drakomire Riders can inflict the On Fire! debuff.
Super Dart Traps inflict Venom.
Possessed Armors can carry a sword that works like the zombie arms carried by zombies.
Poltergeists can throw furniture at you. Their AI is changed so that they can float through the air as well.
Phase 2 Retinazer can charge up and then shoot a big laser like the one fired from the Charged Blaster Cannon. The laser inficts the electrified debuff.
EDIT: More things!
Pre-Hardmode jellyfish can inflict the Shocked Debuff(Weaker version of electrified) when they are electrified.
Black slimes have a low chance to inflict Blackout.
Most enemies that shoot projectiles can sometimes fire a triple shot.
Granite Golems can deflect projectiles when shielding.
The spawn rate of sharks increases when a player is bleeding.
Crimslimes can inflict weak.
Ice Slimes can inflict the Frozen debuff.
Illuminant bats and slimes can inflict the confused debuff.
Paladins can use their shield to become invulnerable and deflect projectiles for a few seconds.
Snow Balla can inflict chilled and frozen with its snowballs.
On blood moons Zombies and Possessed Armors can break down doors like a goblin peon does instead of opening them.
Elf Copters can drop exploding presents just like Santa-NK1.
Crimson Thorny bushes inflict bleeding, Corruption Thorny bushes inflict weak, and Jungle Thorny Bushes inflict poison.
EDIT2: Even more things!
Goblins in a hardmode Goblin Army have their health and damage buffed to Possessed Armor levels.
Sand Elementals spawn 4 Sandnados instead of 3.
The bombs fired from the Prime Cannon detonate when they hit platforms.
Once the destroyer reaches 10000 health it releases all probes that are still attached to it. Contact damage done by the Destroyer has a different immunity cooldown than other attacks.
Probes only have a 25% chance to drop hearts instead of a 33% chance.
Phase 2 Plantera can inflict Bleeding and Venom on contact.
Plantera's tentacles can sometimes inflict bleeding.
Leeches can inflict bleeding. Credit to WasKilledBy_115.
Servants of Cthulhu drop hearts less often.
Instead of shooting regular flames, Mourning Wood shoots green cursed flames that inflict the Cursed Inferno debuff.
The Flying Dutchman can pass through blocks.
Severed Hands only spawn in expert mode Solar eclipses and inflict Obstructed.
Moths fly around much faster and can inflict poison.
Regular Mimics can ground pound like Biome mimics. They cannot pass through blocks with it.
Fungi Bulbs spawn in prehardmode underground mushroom biomes.
EDIT3: More things
The Prime Saw inflicts Bleeding.
Slimers can inflict Weak.
World Feeders shoot Vile Spit just like the Eater of Worlds.
Infected deserts have infected Antlions that shoot the biome's respective sand. Ebonsand and Crimsand can inflict weak and Pearlsand can inflict Silenced.
Cave Bats can inflict Confused.
Hell Bats and Lava Bats can inflict On Fire!
Squids shoot ink that inflicts either Darkness or rarely Blackout.
Undead miners throw bombs that do not destroy blocks.
Red and Yellow Slimes can spawn during a Slime Rain. Purple Slimes are more common.
Spikes Slimes can inflict Bleeding.
Desert Spirits can inflict Cursed.
Ice Elementals can inflict Frozen.
Flying Snakes drop to the ground when killed just like Slimers. They have the fighter AI and move like Worms.
Tortoises can inflict Broken Armor (Might be a bit too strong). Ice Tortoises can inflict Chilled.
Dungeon Spirits can inflict Silenced and more rarely Cursed.
Sand Sharks can inflict Bleeding.
Goblin archers shoot Shadowflame arrows in Hardmode.
Goblin Sorcerers inflict Shadowflame in Hardmode.
Etherian Javelin Throwers and Hoplites can inflict Bleeding with their Javelins.
Mister Stabby can inflict Bleeding with his knife.
Poltergeists can inflict Cursed.
Flockos inflict Chilled.
Hellhounds can inflict Bleeding and On Fire!.
Feel free to suggest more expert mode only attacks and debuffs.
Mother slimes spawn 3-4 baby slimes upon death instead of 1-3 and corrupt slimes spawn 4 slimelings upon death instead of 3.
All fighter AI skeletons throw bones instead of just normal cavern skeletons.
Snatchers, Man Eaters and Angry Trappers can lunge at you quickly and erratically. Angry Trappers can also spit seeds that inflict poison like those that Plantera shoots in phase 1.
Wandering Eyes can pass through blocks during blood moons.
Rainbow Slimes can inflict the confused debuff.
Clowns can sometimes spawn a Chattering Teeth Bomb. http://terraria.wiki.gg/Chattering_Teeth_Bomb
EDIT: More things!
Black slimes have a low chance to inflict Blackout.
Most enemies that shoot projectiles can sometimes fire a triple shot.
Ice Slimes can inflict the Frozen debuff.
On blood moons Zombies and Possessed Armors can break down doors like a goblin peon does instead of opening them.
Crimson Thorny bushes inflict bleeding, Corruption Thorny bushes inflict weak, and Jungle Thorny Bushes inflict poison.
EDIT2: Even more things!
Goblins in a hardmode Goblin Army have their health and damage buffed to Possessed Armor levels.
Severed Hands only spawn in expert mode Solar eclipses and inflict Obstructed.
Fungi Bulbs spawn in prehardmode underground mushroom biomes.
EDIT3: More things
Feel free to suggest more expert mode only attacks and debuffs.
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