Somewhat inspired by Ron's build (https://dundefplanner.com/map.php?load=2874)
Wave 32 - Upgrader Adept (6k+ recommended) and TB (8k recommended)
Wave 33/34 - Swap Adept for a wheeler, add a Guardian Summoner (Hunt/Monk guardians)
Wave 35 - add whichever hero you'd like for an extra reward with a Guardian on it. Any guardian helps here except Squire.
All Buff Beams are 4DU, the two Shock Beams are 6DU each.