I don't know what the min stat requirements are here.

Do not place spiders on a buff beam, and use a summoner with as high of HP as you can get. Damage stat is entirely irrelevant for this build. The damage resistance buff to the spider from the buff beam is not worth the risk of losing the extra aura radius from the buff beam dying.

Wheel on cooldown without exception. Until boss fight.

1. Point 1 DST towards each pawn on that side of the map with 1 extra facing south to help with copters.
2. Ditto
3. Boss wave is most easily beaten with 2 characters, Jester with cat + RM + Ember Scepter, and monk with Seahorse. If monk is on emulator and not an active player, set them on the north side of the crystal, directly touching it. This will generally prevent knockboack from Kraken and Krken cannot damage the crystal. Jester ignores Demon Lords entirely and focuses DPS on Dragon. Upon Kraken spawn, immediately switch focus to Kraken and use Ember Scepter. Upon Kraken's death, immediately focus down the Dragon, even if towers begin to be destroyed. Wheel should only be considered if there is more than 1 active player on a Jester.

Video of the build: https://www.youtube.com/watch?v=vHaBBqvXZV8