what potential of the crafting item do I need to put 2x2 bound focus shards in it?
what potential of the crafting item do I need to put 2x2 bound focus shards in it?
the first step is to restate that question in a manner that clearly explains what you're even trying to ask.
Assuming I got that correct, you are trying to put two greater spell focuses on a single item, which, is impossible.
Spell focuses take the prefix slot. Each item is limited to a single Prefix and a single suffix, in addition to those two weapons and armor can have an enhancement value added. Each of those modifications is in addition to the base item's stats.