Map: The Ramparts
Survival Insane The Ramparts Easy Build. AFK to 15+
Build Status: Public
Game Mode: Survival
AFK Able: Yes
Mana to Upgrade:
More Builds from Trist
There is another similar build to this which makes ample use of the apprentice towers. You can opt to use another flameburst instead of two two explosive traps, but either way will get you to 15+ with no issues.
Get walls up first and then some flamebursts. It does require a little management in later waves (18ish +) as flyers and general HP start to scale a bit higher. A DPS character that can clear waves will life easier later on.