What is the best boss to kill in the "kill in the name of"?

Question

With bosses points you can constantly kill these bosses but what is the boss that gives the best loot?

like "with 50 points"

Answer 1

On high levels can be Ethershreck (Ghastly Dragon boss), with this can loot Golden Can of Oil if you have lucky and The Many (Hydra boss) have regular good loot.

Answer 2

Low level: Deathbine (Can drop good items and you have the change to get the carrot on stick while you do the task.

High level: The many and Ethershreck (both drop good items)

Answer 3

It depends on your level and not how many points you have. 

I think Ethershreck is the best option, have a good loot a low chance to get a Golden Can of Oil.

The Many is the easiest to go and kill but lot has nothing special