Can spawn in both the 22nd and the 24th room down from the zone in.
Info above was gotten from EQ Resource. As of now I can verify he spawns in the 22nd and the 23rd rooms down, still waiting to find out if he pops in the 24th as well.
There's another mob in Sarith that immediately buffs itself with a +5000 magic resist buff when you pull it .. I've read if you pull it with chanter slow, you have no problem slowing it off the bat. This guy might be the same. I dunno. Just an idea.
Desolate Deeds, Curtailing Helix RII, Dreary Deeds AA. AFTER Declaration of Tashan RK I.... never , ever stuck. Was funny.... our shaman was also boxing the main warrior, said "Slow it .. and I'm like, "I can't." Turgurs worked just fine, tho.