faster way to lure heroes in the underworld?

[ᵏ]

is there a way to do them all at once or do you have to keep clicking one by one?

[jimbox114]

one by one. I have found to go back about 10k ranks then it gives you. For example if it gives you say a 18000 ranked lvl 60 player check 28000 players. Scroll around and you will probably find a naked player with no buffs even higher lvl you can fight over and over again.

[Krpa]

Just try to find a high lvl naked player and farm him as much as possible.
Got a lvl 250 naked guy who I'm attacking since last week.