Enderium

Enderium is an alloy added by, and.

Thermal Foundation
Enderium is introduced in Thermal Foundation as the top-tier material. It has little use in the mod itself, but is used to craft resonant-grade machines and Tesseracts in the related mod Thermal Expansion 4 or 5.

1.7.10
Enderium can be made in Thermal Foundation by mixing Tin, Platinum and a bucket of Resonant Ender.

Contrary to other Thermal Expansion alloys, the Enderium blend must be smelted in an Induction Smelter, together with Pyrotheum dust.

Ender IO
Ender IO does not add Enderium to the mod itself, but a compatibility recipe is added allowing Enderium to be made in the Alloy Smelter in two steps, through a newly added intermediate Enderium Base.