Grumsznar

Grumsznar was a drow wizard of House Fey-Branche in the mid–14 century DR.

History
He was encountered by an adventuring party, after they had been sent by Ssar Tarell to find a way to enter House Do'Urden. Grumsznar told them he couldn't allow House Do'Urden to acquire the three parts of the legendary Spider Helm, the final piece being a gem. Thus, he planned to use the companions as a distraction.

He gave the companions the house entry password, and sent them to meet with Rizzen Do'Urden, who would provide them a map of House Do'Urden. Furthermore, he suggested that in order to gain full entry to House Do'Urden, they appear as part of a returning drow patrol. Therefore, with his illusion magic, he transformed each member of the party into a drow version of themselves.