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To be honest, I'm surprised that no one seems to understand the idea.
Basically, there's a map shader file inside the game archive, which is an xdb file. This file contains the ID of the object, among other things. On the map, the object is placed based on this file. So, if an object is on the map, it means that the map file has a reference to the map shader.
Now, what I want to do is simply change this map shader for the Leprechaun or the Circle of Fairies, add a new model and a different ID to it.
Specifically, I want to use the ID from the Naga bank, which never appeared in the game. The bank itself can be made in any way. I'm planning something like a "bandit's lair," but the ID needs to be taken from the Naga bank because then I can assign any guard to it, regardless of other banks.