Aetherworks

An excellent overview from SeriousCreeper:

Aetherworks is an expansion for the Embers modification by Elucent, introducing a new valuable material - aetherium, as well as powerful tools and weapons crafted from it. The main focus of the mod is centered on the process of mining and processing this unique resource.

Players will need to locate aetherium ore deposits, construct complex multiblock structures, and use the mighty Forge to create an impressive arsenal. This expansion is designed to provide players with top-tier equipment within the Embers mod framework, perfectly suited for the endgame stages of progression.

The mod is fully integrated with JEI, significantly simplifying the crafting process and recipe exploration.