From what I can see, currently the only way for your Soveriegn to gain experience is by him personally killing things.  This almost forces one to use their channeller in a combat role.  We need other methods of acquiring experience so that our channeler can level up without being a combatant.

Kind of going off of this as well, I would like to reiterate the point made on at least a couple of other suggestion threads to allow us to choose what aspects of our channeller advance (or have it shaped by how he/she gained the experience) rather than just have blanket increases in statistics across the board.