And there was Tralsai, and his fate was truly terrible... He got involved with Inferno... And as always... I'm absolutely sure he didn't go to them on his own... Either some succubus was involved, or he was sold into slavery to demons as a child, and it messed him up... It's a pity...

Tralsai indeed has a sad story... He was just unlucky to be born into the clan of the Grim Hearts (Grim Hearts :D). Railag defeated this clan, and Tralsai really wanted to avenge Railag for the murdered relatives. And Biara, in the form of Shadia, was already here. But in my opinion, Tralsai either went crazy after the death of his parents, or he was extremely obsessed with revenge, which even allowed him to sacrifice his fellow tribesmen to demons... But personally, I didn't feel much sympathy for him, because I like dark elves more in their relatively good incarnation.