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From Age of Conan:
"Beneath the streets, the city's cellars and sewers blend into the halls of the long-dead city that once stood where Tortage stands now. These labyrinthine passageways once echoed with the tread of the ancient Acheronians. Now they play host to other, even more degenerate threats - threats which somehow echo the dangers of the past..."
Tortage Underhalls is Strom's subterranean prison ward under the Keep. Men and women held in the Underhalls change into hateful, twisted individuals who soon join with Strom's faction, if they even survive at all.