TwoSix
Everyone's literal second-favorite poster
I can see the resemblance, in the vestige signs. That would be an interesting feature.Honestly, reminds me of the 3e Binder.
Which means it might make a good Warlock pact. There's the book, the chain, the blade. There's also the...soul? The body? The forgotten Vestiges of powerful creatures want to experience the world for a moment longer, and you can use their powers, but as you do, they manifest through you.
I would personally call it a blood-pact, as I see it as being a pact that you personally didn't make, but has been passed onto you via a family curse/bloodline, etc. I guess part of that would depend on whether you like the thematic concept of your character being given this curse that he didn't earn via his own volition. I know some people really don't like that concept for D&D characters.
I could see that working well for fey or infernal powers. I think draconic or abyssal type powers should feel more visceral, though.