I need ideas for my ultimate adventure mod.

Hi, radscientist44

1. Add castles or towers with pillagers and good loot: enchanted iron items, bows, crossbows. You can add traps for difficulty.
2. Add more medivial weapon, that you can only buy from villagers
3. Add more enemies for desert, end, nether and other biomes
4. Add credits book, if somebody will give you ideas, you can add them there.

I hope you like my ideas and add them to the game.

We would need a bit more information on the mod such as any lore/story, current creature/species types, rare material types, and the Minecraft version will help a lot with knowing limiting factors but here's one idea that you could use which I would consider simple (only requires a small bit of research if you don't know how to use jigsaw blocks).

Idea: Create a Towering Spire of Stone which has some mystical elements

Design:

• Jagged stone pillars stacked vertically like a broken spine
• Has occasional cracks within the spire which contain glowing ores
• Moss and vines can be added for extra decoration to show aging

Features

• Can have hidden alcoves between each pillar of stone for some loot
• Some Rare mob types could spawn on the pillars (can guarantee through structure block saving)
• Some parkour elements like ledges and vines to help with climbing the spire
• Could possibly have a guaranteed block/item of value spawn at the top of its peak for players to gather (possibly used for a unique item or block with interactions)

The structure could be called "Pillar of Eternity" or you could invert the structure to go down into the ground and make a massive sinkhole that increases in size the further you go down (this will require a lot more work than the pillar idea).

a dense forest with trees approximately 60 blocks tall and camping tents