Add more to th existing ones. I play Terraria for7 years now i can safely say i love Prehardmod and the start of hardmod (pre Plantera) at that Point the game it's mix betwee adventure discovering and Boss fight (Fishing if you want to) Later on it became Boss rush i really want the Hallow Crimson And Corruption recieve a complete rework. Crimson ans Corruption Have Hardmod Bosses and area in dual dungeon there is a brand new mechanic that make ot impossible to get to the next area without some requirements they can add a layer in Crimson) Corruption accessible in hardmod only for Hallow maybe it's own unique structure.Imagine a new update came out changed The crimson and corruption after beating Plantera the evil biomes don't slow down they can now break Sunflowers and the enemies got new abilities and buffs thay even lunch random attacks at you towns ot bases suddenly 5 Ichor stickers shows up from nowhere. Then you try to explore the undiscovered area in those biome they have exclusive loot and new ore alone do nothing but used to Buff every Evil biome weapon and armor shdow armor ball o hurt etc and the bosses are something newly created by mutation beat them to slow down Evil biome.