Vakuu Relic Idea: Feigning Brazier

Ok, this could also totally be something with Tezcatara, but I thought it’d be interesting to have an Ancient relic that only screws you over during the boss fight:

Gain Energy at the start of each turn. At the start of the Act 3 Boss, apply 4 Vulnerable to yourself, and add 2 Burns to your Draw Pile.

Vakuu has plenty of energy gain already, and I kind of want this to stay an Act 3 relic, even if it would thematically work with Tezcatara. Would love to hear any other upside ideas for it, or any input!