Weapon gem creation

Has anyone upgraded weapons high enough to get the abilities that creat gems, example mang with warm. By the wording it says create a red gem, it doesn’t say random. If it creates a gem I can place I am good with that, if it randomly creates a gem it almost ruins the weapon. I would try it myself with a weapon I don’t use but it seems only to be on legendary and mythic weapons and those stones are too rare right now to waste like that.

Create destroy explode gems are all random, and only explode is worth it.

Ok that’s what I figured

The game engine isn’t able to let you pick the spot to place the gem. Spells only allow you a single interaction click, for Mang that’s already required to pick the target troop to hit.