From The 5 Kingdoms Tome of Knowledge
Murmanityed who conquered the Kingdoms from 0-10 TC. Nagul was believed to be searching for the Crystals of Power. He was eventually overthrown and killed in his tower at the Plain of Lances.
Those heroes who slew him - and later became rulers of their nations - never told a dark secret - after Nagul was killed, his head was never found.
Nearly two centuries later, rumor has it Nagul has been brought back from the dead.