Hey !
I've been working on a mod to replace biome sprites of vanilla bosses to their corresponding faces, so that way i don't have to roll whether or not the Arctic i click on is actually Selicy or Violette. (I love to keep Violette for last, just for fun)

I've made all the sprites (thanks to Asset Studio) ready for that and looked at the original Zones.xml to see how it's done.

And actually, it felt quite easy at first glance !

"Just do a duplicate of the Zones.xml to replace the content of the icon field with the new icon in a mod folder and put the icons along with it and there we go" I thought... How wrong i was lmao.
At this point, I've tried a bunch of things, i even tried to load my mod with the changed zones and no data of the changed zones in the original Zones.xml file, without success ofc as it fails to go past a black screen after pressing Start.

Any idea on how to tackle this one ? I feel like it could be a nice QoL mod but it really feels like the game does not want us to mod it that way.