Yeenoghu
Yeenoghu, the Fiend Lord, is the demon-power said to have made the gnolls - cursing them into a feral, ravenous race that roams the prime material plane seeking only to consume and to destroy. Among the powers of Thelemar he is reckoned a lesser deity.
His curse, the “Grasp of Yeenoghu,” drives the gnolls to their madness, though a rare few slip it and seek a gentler life among other peoples. The gnoll priestesses keep his worship with blood rituals, giving up to him the lowest-ranking of their own.