Talisman items
Gives you health, damage, luck, abilities and other special attributes. (If possible use custom textures.) I would like if we had a bag for them.
Weather Changer
Rain is pretty annoying, so I would personally like to see a weather changer, probably should be a limited time use for balance purposes or requires items.
More ender dragon types
These ender dragons would have special abilities. For example, striking the player with thunderbolts. This will have more boss variety and more difficulty. (Maybe add custom drops?)
Hard Endgame Bosses
Minecraft bosses, in my opinion, are way too easy. So maybe add hard endgame bosses to challenge the player, but make it balanced with custom drops.
Progression
Maybe the progression should be slower, encouraging building actual bases and stuff.
References
This is just a little thing I like, but I'd be happy to see references to Touhou and Blue Archive. I enjoy those games and they don't have enough Minecraft content
Artillery
For fortress type things, add mortars, cannons, howitzers, etc.
Ocean Variety
The ocean needs more variety. More fish, deep sea monsters, structures, and better terrain would be nice. Ambience would add to the mood.
Potion of Decay
Potions of Decay brewed with wither roses.
Buffed Mobs
Mobs need to be buffed. Most of them aren't even a threat. Speed, health and damage changes should help.
