Thermal Extra is a Thermal Expansion addon that add more augments to the thermal serie.

Metals

Thermal extra add 4 metals : soul infused, shellite, twinite and dragonsteel.

each metal has its own molten fluid, ingot/nugget/block/dust and a hardened glass block made from the metal.

Augments

Therma extra add 5 augment tiers as follow : soul infused > enderium > shellite > twinite > dragonsteel > dragonsteel infused.

dragonsteel and dragonsteel infused only support a few augment type.

as of 3.0.8-1.20.1, thermal extra add a frost dynamo that generate RF from cold items/blocks.