Suggestion: Klaas giving Arcane and mythic eggs

[Energizeric]

Or a quest, like collect 500 skulls from wolves and exchange it for a mysterious chest that works like any regular chests with same % chance of getting legendary, mythic, or arcane.

This already exists. There is a quest where you have to kill 20 elite nordr bosses and you get an Elite Golden Warchest which can give you an arcane or mythic item.