The tower was mistakenly generated in the End.

Minecraft: 1.21.1
NeoForge: 21.1.186
ToTW Modded: 1.0.8

Hey,

I just came across this issue as well. I ran Structure Essentials and discovered all the vanilla end biomes are tagged with #c:is_cold, which is an entry in this file: data\totw_modded\tags\worldgen\biome\has_structure\ice_tower.json

I overwrote that file with a datapack, changing that entry to #c:is_snowy. That fixed the issue for me. The entry could be removed altogether as well, but I wanted to give the tower a chance to spawn in some BoP biomes. :)

Before file change:

After file change:

which game and mod version are you playing on @lingxi0708 ?

Minecraft: 1.21.1
NeoForge: 21.1.145
Towers of the Wild Modded: 1.0.7

Could you provide me the seed and the mods that you had loaded, as well as the coords on the map so I can diagnose why it spawned there