Summary of the problem Tinkers' Construct's Magma Slime Islands Don't Spawn Pack Version 1.5.3 What is the bug? Tinkers' Construct has magma slime islands that typically spawn in the Nether, however I have searched for hours to find one to no avail. Mod & Version Tinkers' Construct Link to log file N/A Is it repeatable? Yes, I have created a few worlds and played on a few servers and have not found a single magma island in the Nether. Known Fix I have done research and have found out that this bug is most likely caused by Natura or Biomes o' Plenty https://github.com/SlimeKnights/TinkersConstruct/issues/2952 According to that github link there is a way to fix by disabling Natura's override on the Nether via configs.