It means I will expand your mind in ways you never thought possible.

[Ushahin has always had a flair for the dramatic, and right now, it shows. He's very old and has had a long time to hone his skills into the powerful form that he now possesses. He sends a few images into Richie's head, pushing past the snake defense with ease so quickly it's startling. There's an army torn asunder and scattered as he invades their minds while Ushahin watches safe behind his own lines, a crooked smile borne of insanity on his face. A sorceress who had pushed him too far, subject to her darkest fear of growing old and dying. Finally, there is the dark vastness that makes up a dragon's mind, like staring at the blue-black of the night sky without any stars in it.]

I will teach you everything I know if you are willing and your mind strong enough.