As we all know, Vamps are the most horribly broken class in tge world. The real problem's their conversion rate. 40 for a health booster?! It needs to be 50 if not 60. Even so the only reason the extra help is so cheap is the sanguine % combos with the life steal to break the game. Now if you couldn't raise sanguine it would be a much more fair class. The best tier maybe, but storage it will stop getting 180 hp per bloodpool.
So that raises the question: What do you change? The Vamp or Blood Tithe?
If the Vamp is the one to change then what do you do? Remove all Sanguine and raise the rate to 45-50? Just remove Sanguine? Just nerf the conversion rate?
If Blood Tithe is the problem, then how do you change it? What is the benefit? Mp, Attack, EXP? Or perhaps you make it do something like give him 5 hp to lower enemy resists or something. Perhaps enemy hp? You lower your hp by 10 and they do the same with 10 or so percent? With a piety cost similar to Blood Hunger it would be like Whupaz. And if you removed Whupaz, as it is such a HUGE no brainer it has to go, then this would be a more ample replacement. You might want to make the piety cost less, but only make it repeatable 4 times or so.
I'm really not sure. It obviously has to change, but the question is how.
I speak chaos.