
Calamity Mod - A massive mod with a world difficulty option above Expert, many challenging bosses, ores, 2 biomes and a lot of items. Also lots of bosses post-moonlord.

Spirit Mod - Another massive mod with new NPCs, 2 more biomes, ores, events, bosses and items.
Fargo's Mutant Mod - Lots of OP end-game items which take a few days straight to craft, and an NPC who sells boss summons once you beat that boss. The vanilla boss summons sold are custom and allow for that boss to be summoned anywhere at any time, making grinding bosses much easier

Pots and Boulders - Adds more mimic variants, instead of just chest mimics! Great and original idea in my opinion.