HEROES OF IMPILTUR
This lich-lord is the undisputed ruler of Thay. Formerly the Zulkir of Necromancy, Szass Tam fought a civil war against the forces of the other seven Zulkirs and incredibly won. Ruthless and intelligent, he often wears a human looking form to put the non-undead at ease. However underneath lies a horrific being who is master of the blackest magic known on Faerun. The heroes encountered him as they were looting several magic items from the Wizard’s Reach. He offered the group a proposition. Each person must submit to a geas, a magically binding oath, to obey one future command from him; or they could challenge him and die. Some agreed and are bound by the oath. Others bravely challenged him and were killed. Afterwards he raised those that were killed as undead before releasing them to leave.
Recently while in danger of being overrun by an army of Frost Giants on the Glacier of the White Worm, Alkorahil was visited by a mental projection of Szass Tam that only he could see and hear (probably because Alkorahil was undead). Szass showed Alkorahil where a hidden escape route lay hidden and used his geas to force Alkorahil to enter the tunnel. The rest of the heroes followed the paladin into the tunnel and escaped the fight. Alkorahil was freed from his obligation to the necromancer and the path that he put them on not only led them out of danger but quickly put them back on track towards their quest to enter Bitriarch’s Vault. Szass Tam’s motivation for helping the heroes remains unknown.