The Greater Focus is an item used in various AM2 machines as a means of instructing them to operate in different ways. It can also be used as a crafting ingredient or spellcrafting ingredient.
The Greater Focus is used in spellcrafting and to increase the range of machines like the Seer Stone or the Astral Barrier.
To craft the Greater Focus, you need:
2 Purified Vinteum Dust
The recipe, seen below, is: Arcane Ash in the top-left, top-right, bottom-left and bottom-right, Purified Vinteum Dust in center-left and center-right and Standard Focus in the center.