Best monster to task for points in "Killing in the name of" at high level?

Question

What is the best monster to task for points for the quest "Killing in the name of" for high levels?

I want some place that gives a reasonable amount of exp (800k/h+) for high levels (300-400).

I tried hunting Hydras (Talahu) and Sea Serpents, but the exp is too low. Is there a better place to get points?

Answer 1

Medusa and Serpent Spawns at Goroma [1.3kk/h] or TH at Medusa Tower [1.8kk/h] (Behemoth + Serpent Spawn + Medusa at once)

Answer 2

Medusa + Serpent Spawns + Hydras in Deeper Banuta or Drakens at Walls in Lizard City.