The Rending of Palaghast
Ruler of Pala-Morto, Domain of Death. Rarely does he come up from his Domain to meet with the other Solars. The Deep Gnomes are his loyal subjects, expanding his vast empire beneath the Seven Domains and defending it against the twisted monsters left behind by the Being From Beyond.
People often use the threat of Morto and his realm to keep their children in line. That he'll leave his realm to come and pull them down to serve him and his Deep Gnomes.