Vegeta Challenge - Magic Armor - 400 level

Monsters on way:
Reward:
We go to the place indicated.
Talk with NPC King Vegeta: Hi -> quest
He will ask us to kill: 500 , 250 , 100 , 40 .
After killing the required number of monsters, he will order us to deliver: 75 and
As a reward, we get access to the arena: Hi -> arena -> yes. 4 people are needed to complete the arena.
You need to withstand subsequent waves of monsters: -> -> -> -> .
After killing Bebi, we get access to the boxes, after pulling the lever.