I've been trying to us Biometweaker to alter the vanilla end biome into something a bit more interesting. My tweaks take . . . but only if I disable the Stygian End Mod . . . if I turn this mod on everything resets to a set default every time.

If you could figure out why this is happening I'd really like to get it fixed. This is the only mod that adds anything interesting to the end . . . and I'd love to be able to build on it by tweaking things around and give players a really different and interesting experience. :)

Adding onto this, I've been thinking of using CoFH World to add custom content to these biomes in the form of stalactites and biome-specific ore generation. This would be much easier if I can tell the mod to only generate its worldgen in specific biomes.

As a temporary workaround, I could tell the stalactites to only generate on top of Stygian End blocks.

I doubt this mod will ever be active. Unless you're willing to continue this mod, then its dead.