Ascension upgrade:gain a (5%-10%) chance to gain an armory chest when you slay a mimic.
(You can't gain multiple armory chests from the mimics in a single chest hunt)
If its a regular ascension upgrade: 1qa
If its an astral ascension upgrade: 1qi
I think the ≈10% chance you have to get a chest in a chest hunt is too small given the fact that you have to also find it, so i think giving a more "consistent" chance (you have the saver so you kill at least 1 mimic every chest hunt) to find one is a good idea.
Its also not too op giving you a total of 20% to 35% chance (for 5% and 10% respectively) on a perfect chest hunt.