The post above has been very helpful!
Ok, finally did it. My kingdom gold dropped by about 8000, though, but mostly because I kept killing myself on the retaliate fireball floor. Luckily, this time I hit is soonish, and I managed to survive the obligatory "forgot what floor it was after 3 monsters" ^^
It was a very, very, very strange run. I decided to bring patches in, inspired by sidesteppers last post, but the opposite happened - the little bastard gave me 0 hits of resistances. 0. In 15 level ups or so... Gave me 15 mana post taurog, a big bunch of health and some gold, so that's something.
Anyway, I prepped GG and found an early GETINDARE, found the resist scroll soon enough, but since patches wasn't putting out, I decided to join Taurog pre-enlightment, but post illusion boss (handling that guy without cleansing is asking for fail). No absolutions, those aren't too good on VGT, especially if you're a patches sporting priest, and cleansing is working out incredibly for me.
I decided to convert gloves of midas rather than patches, which turned out to be a good move, and upping your resists asap is the best way to save resources - taurog got me through two floors on that +15 res. I joined Drac afterwards, took two hits of sanguine because I decided to save exploration rather than bloodpools. Ended up saving a lot of bloodpools in the end.
For the boss fight I had platemail and byceps, and long rant (but I forgot to use it
The most curious thing is that I didn't actually desecrate EM at all this time. I had viper ward so I managed to save 2 health potions and the alch shop for the boss fight, but I had no mana whatsoever (Patches, for the love of Jehora!). I did have byceps, so, Inspired by sidestepeprs observation, I bought a schadenfraude potion. Used my health potions while in drac for lesser piety hits, used up all the bloodswells, used up all the sanguine in the process, and got horatio down to 2% res and rather low on health. Had some exploration though, but not enough gold for the assassins dagger which woud've been nice,.
So I took consensus (he he, saved it), and joined GG, and started spamming protections for the mana refill on top of the health refill, and converted everything I had left + desecrated Mystera. And took away her penalty with Byceps. Scraped through (even though I still had one protection and a bloodpool left), on a byceps + getindare hit.
So, all in all, I managed to not kill my own stupid self and played it well, got lucky in places, got very unlucky in places, some floors gave me a hard time, but all in all, the priest isn't half bad at it. Big health makes for big sanguine, 2-3 healing potions make for a lot of damage once you stack resists, and the +100% undead damage helps you not get mana burned by wraiths (if you can do the whole 2 fireballs + getindare, and I've sometimes bought the mana pendant precisely for that).
Nice, what's the next tricky proposition? I suspect I could do a monk, and I think the crusader might be doable (understatement, but still, Rogue is the only thing close to easy mode I've seen so far).
EDIT: All this VGT bussiness makes me think I ought to go grind a huge bunch of gold for more veto slots. I allready took some stuff out and put some other stuff in there, but I have one more to unlock and I have more stuff that keeps coming up unnecessarily. Hmmm...