Rut (pronounced /rut/ - "root") is a demon of Xolrut (literally 'light of Rut'), representing the red dwarf in the Xollum-Xolrut System. The star is distant but still one of the brightest objects in the Impendian sky, and its angular distance to Xollum is believed by Xol Impendians to be portentous of doom and destruction.

The demon Rut exists in many Impendian religions both ancient and extant, but in Xolhengianism, the demon is thought to be the reason for the hydrocarbon smog which covers most of the planet, which will be cleared away by the 'arm of Um' during 'Liwisblodrutum.'