You should only really need to upgrade the buff beams,Auras,DTS,LTS, and Mages. I suggest a monk+huntress guardian on LTS.also there are extra MU for this to add more mages which you can add with the other two mages. (edit) after this build you will or should have 3 du left. i personally place a prox trap near 4 but you can do whatever with the extra du
I advise someone runs a Malphas or any other defense healing pet next to the one spawner near the LTS so the auras get healed and you only have to heal the aura on the north west core.
Also i Wrote down 3k aura hp so you wont have to heal the aura doing 2 man until the end of each wave, And if you start at wave 28 you can max out every buff beam and get the mage minions to star or 3 star so you don't have to bother upping them later which would finish all minion ups needed.
15 December 2021
I advise someone runs a Malphas or any other defense healing pet next to the one spawner near the LTS so the auras get healed and you only have to heal the aura on the north west core.
15 December 2021
Also i Wrote down 3k aura hp so you wont have to heal the aura doing 2 man until the end of each wave, And if you start at wave 28 you can max out every buff beam and get the mage minions to star or 3 star so you don't have to bother upping them later which would finish all minion ups needed.