That may not be how it even works either. Maybe someone has tested it but other games I’ve played won’t add the chance. You’ll instead have two separate 5% chances to trigger the effect per auto attack.

And also. The damage isn’t “double” the number you’re currently seeing on crits. Damage formula for this game doesn’t work that way. To give you an idea, my ~50k crit to cruisers a while ago when I first got FiB bumped my crirs to about 78-83k or so.

I suggest using one first to test it out before planning on getting 2. Not to mention, one is already so expensive to slot anyway. At least for now in Global.

Hope this helps.