User blog comment:StalkerInWoods/Darkness and Chants/@comment-98.238.125.52-20131112212532/@comment-15558724-20131113171834

There is no special chant to invoke Sathili'os, but you can talk to him by doing the "Dark Meditation". As for invoking darkness you don't. Darkness is a power but also a being. There is no way to invoke it unless you're a High Protector, and it's not invocation. The process it's called Rathme'erih (which means Locked Summoning). Hope I helped.