Kthanikahr cares not for humanity, but he is interested in preserving this planet as a habitat for his worms.
-Artur Belfry, Imperial Witness, concluding his confidential report to the Blackwatch
Kthanikahr - The Worm Lord - wants the whole of humanity to be devoured and replaced by his worms. It is rumored that Wormclouds stem from Kthanikahr , that when the Emperor struck him down, the Great Elder personally blighted the weather.
Before the Emperor's rise to the power, Kthanikahr descended upon the Dylian Mountains - the home of Estyr Six and killed everyone of her kin. Great Elder was later on engaged in a battle by Estyr Six on the slopes of the Dylian Mountains which were destroyed as a result and formed what would be known to the modern generations as Dylian Basin.