Weertangel
Steampunker
Solar Pillar is the hardest, not cos of the Crawltipede, but becouse of the other mobs, that go trough walls and shoot fireballs at u.
Nebula is 2nd tho, but only barely, since instead of staying on the ground u need to keep moving couse of the projectiles and the teleporting enemies.
The best way for all pillars to kill them is with a Nimbus rod above them or with a ranged weapon, like that vortex bow(forgot his name) as soon as the shield drops.
The other 2 u can do without to much problems as long as u keep moving and/or have alot of minions,UFO minions and Star Cells work best altrough stardust dragon could also work, if u could make more then 1 that is..
Nebula is 2nd tho, but only barely, since instead of staying on the ground u need to keep moving couse of the projectiles and the teleporting enemies.
The best way for all pillars to kill them is with a Nimbus rod above them or with a ranged weapon, like that vortex bow(forgot his name) as soon as the shield drops.
The other 2 u can do without to much problems as long as u keep moving and/or have alot of minions,UFO minions and Star Cells work best altrough stardust dragon could also work, if u could make more then 1 that is..