Terrasteel

Botania
To create a single Terrasteel Ingot, the player must perform a ritual-like infusion. First, an active Terrestrial Agglomeration Plate will need to be structured, then the player must throw a Manasteel Ingot, a Mana Pearl and a Mana Diamond in any order on top of the plate. Utilizing at least a half-full Mana Pool nearby clouds of Mana shall appear and circle the Terrestrial Agglomeration Plate briefly and clash together, until finally upon a final clash of the Mana clouds a Terrasteel Ingot shall be created and dropped on top of the plate.

The previously created Terrasteel Ingot prevents another creation unless it is picked up or despawns.

Flaxbeard's Steam Power
Flaxbeard's Steam Power only adds the plate variation of the Terrasteel material. The Terrasteel Plate can be created by throwing Terrasteel Ingots into a heated Crucible, and then pouring that molten metal into a Mold with a Plate Mold. Six nuggets are used in the creation of a Plate, which makes it unable to be used in other mod's recipes requiring their own Terrasteel Plates.