[Envy is pretty sure that Wrath is the one who made up all that about what happens when you break one, because that sounds like a VERY WRATH THING TO COME UP WITH. But he nods solemnly, even widening his eyes a little, like he believes every word.]

Then I really won't be able to break it, not even if I wanted to.

Okay, so how do we make this promise? Anything special we need to do to make it the real thing?