The Guidance of a Mad Man

We have kept a close eye on your growth <name>.
You have outwitted several demons under your command, conquered many foes, and kept a lot of allies at your side. There is very little any of us may teach you at the moment, you have gone above and beyond any of our expectations.

However, there is someone that may yet have something to teach you about the ways of the warlock.
Venture to the Blasted Lands and seek the one called Daio, there is a slight chance you might've already met.

Welcome <class>, I assume you are here to learn about the secrets of the Twisting Nether and how you may claim them as your own.

I may have something to teach you, but it won't be easy in the slightest.