Thanks for the chapter!
BTW, does anyone know whether the whole party are the heroes chosen by god, or whether Yuno and six others were chosen, formed parties and went separate ways to get massacred except for Yuno?
Based on what seen and title I'd say both the hero and priestess are two faced lying, backstabbing bastards. Granted they should be punished but MC shouldn't drown himself in revenge. They're not worth him destroying himself to get back at them and if burns himself up getting revenge he'll just feel empty and with no idea what to do with his life once he's done. In any case something is up between those two. Not sure if it's just bullying, warped sense of pleasure NTRing the MC or some ritual but Irina would usually start distancing herself from MC rather than asking him to marry her when everything over. Unless she's planning on forming a reverse harem that's something only said to someone to raise a death flag or make them really miserable when the affair is revealed. Frankly getting a little tired of seeing all these characters with saintly jobs and appearances on the outside, while having dark, twisted personalities on the inside. Yeah I get power corrupts and absolute power corrupts absolutely but there are people in such positions who keep their integrity and don't let things rush to their head while truly being good like Gandhi and Mother Theresa.
Question is, whether rest of the party in on it, consider it none of their business as long as get their share of rewards, or try to help MC. In any case, will have to see how he gets that skill from them screwing him over and who and how gets his revenge.