This probably won't help but I remember finding a troll shaman in sirens during velious. I must have smacked him around for 10 minutes, including backstabs, and I was very well geared. Couldn't outdamage torpor or if I did not for long, and couldn't run him oom. Finally after about 8-10 minutes he drank a damage shield pot and I was screwed.
At no point did he put his back against the wall. Just decent geared/self buffed/torpor. And of course AC worked.
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Valtiel
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