This is a Bloodshot/Bone staff farming build. It will probably take you 4+ runs to get an Ult+/Ult++ Bloodshot/All-Seeing/Bone/Desert staff. Bring 4 heroes: 3 Summoners and an Adept. There are 5 Lightning Towers on each stack. Place Summoners with Guardian pets on top of each LT stack. At the end of each wave you should repair/upgrade and scout for good Supreme+ items in Overlord mode. Flash Heal with the summoners if they have mana. You can also spend a few waves upgrading with a Genie Jester if the level is difficult for you.
Hint 1 Ogre Copter drop locations.
Hint 2 Auras are placed in the corner behind the stall. To place them here you need to jump from the empty fountain on the wall.