Belshazu

Belshazu was a Glabrezu and the father of the Draegloth Jeggred Baenre. He was summoned a second time during the War of the Spider Queen in 1372 DR by the wizard Pharaun Mizzrym. The drow wanted to know a way to the Demonweb Pits and tricked the demon with a pool of frozen water instead of a summoning circle. Belshazu had to cut off his feet and leave them in Faerûn to get away. Later he tried to get his revenge, when the wizard and his group traveled to the abyss. He was ultimately slain by Pharaun.

Reference

 * War of the Spider Queen (novel series)

Belshazu