This mod adds the following materials from the Undergarden to Tetra:
- Cloggrum
- Froststeel (including Frostbite ability)
- Utherium (including Rotbane and Bloodlust abilities)
- Forgotten Metal (including Threnody of the Deep ability)
- Smogstem
- Wigglewood
- Grongle
- Depthrock
- Shiverstone
Pretty much all the code is from Tetra's mickelus and the Undergarden's quek.