wave 22: Upper, TB Monk, 2x Hunt/App guardians
Wave 23: If upgrading is done, swap to builder Warden
Hint 5: This core can sometimes die/take damage due to archers getting agro'd by the player instead of the golem, I grab the chests during the build phase (adds a few extra seconds per wave)
I shrink my enstanre by 4x and upgrade my buff beam to 3 star during first build phase.