22-35 but with minions, a lot more consistent and reliable. Upgrade the orcs during upgrader wave or else they might go down later on, want them to be tanky just incase they get slapped. (Like embermount this map takes forever, so not ideal for armour farming. Low DU and half a billion HP ogres make each wave around 5+ minutes long)

This build requires high end stats, Im using a 8k / 4k / 6.5k apprentice and its still a pain.

Put south darkness on fence/barrel, and the top east one hide it behind the barrel. Make sure darkness on bridge coveres the lower pathway beneath it and the one in front of it.

Keep strength drain monk boosted (Only 10 towers there so doesnt matter where you stand in stack, so long as you have 2x monk guards)

Golem is necessary as it draws agro of the big boys from anywhere in map, stops them from attacking minion wall.

The seed bomb towers melt through the green guys, otherwise they are standing there for a long time with just LT and will eventually attack minions. Want them dead as quick as can.

Only problems I had with this build were my orcs falling in later waves because I failed to upgrade. 

Make sure orc wall is inpenetrable, cant have any cracks at all

For Final Wave 35: Bring 2x TB and 2x Summoner with monk an hunt guard. I dont know if possible with summoner only.