@DivermanSam The Ragnarok boss is so cool and epic. So much so that it has inspired me to come up with an idea to weave a story into the mod leading up to the Ragnarok.
1. Instead of crafting the Doom Sayer's Coin using nebula fragments alone, the Thorium bosses should drop the materials used to craft it. So you need a piece of each boss + 1 of each nebula fragment, as well as something from the Moon Lord itself, because..
2. Upon killing the Moon Lord, the world should enter a state where the enemies are stronger, and new enemies spawn (also an opportunity to collect some unique loot). The world should enter into perpetual night time as well, and killing the Moon Lord greets the player with a message such as "The Moon Lord's death has caught the attention of the Ragnarok. They have come to bring annihilation upon Terraria. Powerful creatures living in the world may have clues for how to confront this terror.." This state persists until the Ragnarok is defeated. From a lore perspective, it may even be something along the lines of, while the Moon Lord is a threat to Terraria, it was also holding back the Ragnarok from coming down to rain destruction upon its' inhabitants.
As I mentioned, during this unique world state, monsters would be stronger, new monsters would show up, and some new pre-Ragnarok loot could be available. Maybe not a full armor set, but at least some new weapons.
3. Lastly, not only do pieces of each boss create the Doom Sayer's Coin, but they also create an item called "Dormant Ragnarok Soul Shard". The item is an accessory that does nothing, but its immense power can be unlocked by collecting the soul fragments of each entity of Ragnarok (dropped by Omnicide, Aquaius and Slag Fury, if possible.. so in expert mode, available pre-final form).
The Soul Shard and Soul Fragments combine to create Energized Soul of Ragnarok, an extremely powerful accessory granting unique effects. I'm thinking something along the lines of a more powerful version of Eye of the Storm, a defensive ability similar to something like the Beetle Armor, and probably some class-less defensive and offensive modifiers. Additionally, the Soul Fragments also combine with Remnant Energy Shards (drop from Dying Reality, the Ragnarok), to form the summon weapon, The Ragnarok. Takes up 3 summon slots to summon Aquaius, Slag Fury and Omnicide to fight for you.
As a side note, is it possible to add custom messages when bosses spawn? From a lore perspective, it would be very awesome if the bosses would say things hinting at the Ragnarok's impending coming to Terraria.
I haven't coded in a very long time, but I'd be happy to help with this if you think it's worth implementing. Let me know what you think!
EDIT: Maybe even the NPCs have new dialogue pre-Ragnarok. Most of them would just whine about how they're all going to die, etc., but perhaps the Dryad or the Cobbler have something extra to say about it. This line in particular from the Cobbler has the wheels spinning:
"In my younger years, I myself was a hero. I stopped after nearly perishing to a mechanical creation of my own design... I hold much regret in that creature."
EDIT2: Dammit, and now this one:
"Ah, so [Name of Guide] has been giving you advise this whole time...? I wonder if he still hasn't forgiven himself for what happened.." (Only if
Guide is present)
Much ideas. So excite.