Vanity's Brood

Vanity's Brood by Lisa Smedman was the final novel of the House of Serpents Trilogy. "Medusanna A priestess of terrifying power convinces the Se'sehen A yuan-ti tribe from the distant jungles of Chult to serve her growing cult of Sseth Merciless god of the serpent people who languishes in the foul plane of Smaragh Where a trapped and desperate Karell can only hope Arvin will find her before the House of Serpents Finally destroys their last hope for freedom."