Anyone try this out yet? On a ghoul kick lately and have had limited success with Ghoul Sawbutcher. For the most part it was a cakewalk until I decided to open a vault in Dreadfell. Two fire wyrms do not a good experience make. Not sure if I want to try and take on the Master then restart or just restart.

But have had no need to get shield runes up to that point since I have wretch and healing and the negative life salves. Which is nice since Zigur is happy with me, even though I can't see the town which I guess is just a default undead thing.

I still have to unlock the thinker class in the main campaign but I'm not sure how to do it. Do I have to defeat Outpost Leader John in two diferent runs, am I right?

According to the wiki:

Sawbutcher (Tinker meta class)
Automatically unlocked in Embers of Rage.
To use in the regular classical Age of Ascendancy, Infinite Dungeon, and Arena campaign(s) defeat Outpost Leader John with any two (2) tinker classes.

Just beat the main campaign as a Ghoul Sawbutcher. If you haven't beaten the game yet, highly recommend you give Sawbutcher a whirl. It's crazy easy. You have so much stuff that deflects hits you rarely worry about health. And you have stuff that silences and brainlocks casters which makes them unable to do much of anything.

http://te4.org/characters/182265/tome/23a50c7c-ec48-49db-b2d9-16fac284c29d