how do you craft +ailment stacks? do the items have to have dropped from untainted or can all items spawn this mod??

genesis stone craft to target craft it, dropped, or just lucky rerolls

so spamming orbs can get it if youre lucky? i did like 100 and never saw it on an ammy

I don't believe just crafting with a GEO can get it but i'm positive a Ohm can since people had Legendary Trial belts with it on it and u can't anul and slam only Ohm

If it's socketed with a genesis stone it can roll it by chance. This is only on belts, rings, and amulets I believe.

how do you get aether jump on a shield?

Same way. Genesis stone and roll it. It's not very common though. Because you can get any spell added to it.