Removing the mod
You need to uncheck the disable vanilla ai before removing the mod.
Rampant using lots of memory when using new enemies
Adds news enemies that will be dispersed over the world. This increases the RAM requirements. With 1 variation for each biter, worm, and nest and 5 tiers expect upto a 2GB RAM increase. With 20 variations and 10 tiers set expect up to 9GB RAM increase. Variations add randominess to each tier of biter, worms, or nests. Tiers are the power level of the biters.