Qah is a god belonging to the pantheon of gods that existed during the period of the war between the Necron and the Old Ones called the Slah-Haii (meaning most ancient). Slaanesh destroyed Qah by splitting him into pieces, trapping the pieces halfway between the real world and the Warp. How this occurred is unknown but those pieces formed into beings now known as the Umbra. Qah is known as "He who lingers" by the Hrud because Slaanesh banished him to linger forever. Occasionally when an Umbra dies, he psychically screams "LINGER" in reference to Qah.
Qah was and still is worshiped by the nocturnal race the Hrud. He told them before his destruction (500,000 years ago)that he would return during the time of the Raheed-skoh (or tribe gathering) to defeat the Yaam-khoh.
- Xenology, pgs. 38, 80