I know I'm a bit late to this party, but Tyll'a is actually completely cut off from his aether. When he was an infant, his mother had a summoning accident, accidentally summoning a minor primal. No one was hurt, thankfully, but Tyll'a was cut off from his aether, and that's why he can't use magic.
Of course, he doesn't know any of this. He only knows that he can't use magic, and he wants to find out why!
Of course, he doesn't know any of this. He only knows that he can't use magic, and he wants to find out why!