I like the dimensional bolt concept. You'll still have to work with other skill trees/characters to get more reliable surfaces and elemental interaction you want, but summoners should have some way to create a basic surface, even if it's random. Like Neonivek says, it could mean hitting undead with a poison attack. Or perhaps dousing and burning of an enemy with a water attack, or starting a stun chain reaction when you didn't want to.

Last edited by Baardvark; 30/03/17 05:40 PM.