Thats weird, I just did a bit of testing and these were my results. (Used neruina fto check for ticking) (Other mods mean all the other mods that I think aren't causing an issue), Other mods + added ftb chunks -> no error Other mods + FTBchunks + quark -> armour stand entity ticking crash Other mods + Alexs caves alone -> no crash Other mods + Alex caves + T.O Iron's spells addon -> causes entity ticking <--- could be more than entity ticking If quark has no issue in the latest logs then uhhh im not too sure. (I'll probably just play with neruina removing all the ticking entities), but thanks for your help.