Not at all. Thanatari are not heroic age warriors who decapitate their foes after killing them in combat and keep them as trophies (which sometimes even continue to talk and advise after death). Thanatari are a *perversion* of this. They decapitate the still-living, magically enslave their victims, and torment them forever (unless released by Lhankor Mhy's ritual).
Chaos cults like Thanatar are perversions, despised even by head hunters.
Jeff
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