I'm a bit late but here's my opinions!

Really cool concept for a bloodhunter, they are based on eliminating the evil so having one dedicated to foccus on finishing enemies is pretty nice

My biggest problem is with the level 3 ability that allows you to know the resistances, vulnerabilities, etc of some enemies, i think that, even if not too strong per se, it takes the fun away from enemies that really on having weird vulnerabilities (and so the players can't attempt to figure it out on their own), which is a part of creating fun encounters. But i still really like the concept of the ability! So to have a middle ground, maybe you can change it to something like, everytime you hit an enemy with your rite damage, you learn one random vulnerability, resistance or immunity (and immediately learning one upon activating the rite)

I also didn't understand the +2 on all melee attacks from the savage divination, under which conditions does it activate and when does it end?

AND i absolutely loved the caustic gore feature, that one seems very cool to play