
(there's still 12 bloodpools left that I couldn't drink, and probably I should have not desecrated EM and those could be worth more piety. Towards the end, I even had to convert off my Vampiric Blade in order to farm piety from bloodpools, otherwise I wouldn't even lose health at all)
"Mistakes" made:
1. Not using Weytwhut at all, could have gotten more XP.
2. Converting off Wicked Guitar when I was ready for the bosses. I "lost" out on some potential XP from 8 mobs (4 pairs each of L6s to L9s).
3. As mentioned, should not have desecrated EM. You know what, you could even push Piety even higher by "preparing" for some shenanigans. Make sure all mobs remaining are within 1-hit to death. Convert over to EM, use Entanglement once. Slay everything, profit from the juicy bonus XP. Use Plantation, convert to Binlor. Use up all remaining item conversions (buy as much from shops as possible) for mana potions to break walls (assuming you got Endiswal from him earlier). Convert back to Dracul (or just desecrate him).