What should I do with Fenris?

[Deftonics]

I just got Fenris from reaching gold tier on the Necropolis event. What class should I open his egg on? Or should I save it for after the event? The only other pets worth mentioning that i have is Magma, and Lemon and Lime.

[resurrected]

Magma is OP! You can put fenris HB in lemon and Lime ( armor bonus is cool in harder maps) or just sell it