Mages of Mystralia (EP)

Have the following wand equipped: Igni Wand (this causes fire magic to do even more damage, which will already be stupid high from the spell I've set up)

The best and easiest way to do this is to wait til later in the game. If you enter The Rise from the lower right hand side, and head towards the area where there was a breakable rock, you'll find green goblins - 2 club and 3 spear, you have to have already broken the rock, at this point you'll have ot move to the left towards the bridge to get the spear goblin above to come down, once it's down run back towards the right hand side so the spear goblin all bunch up underneath a large rock formation, then run back towards them and past them to get the two club goblin near them, then unleash the following spell:

Fire based Creo with: Swift, Size, Move, Mastery, Rain, Time. It'll easily kill all 5 of them as long as all 3 of the spears goblin are inside it's damage zone, it lasts plenty long enough to kite the two club goblin into it if you have to, but you shouldn't have to, it has a pretty large AoE

Alittle tricky but i did this when the arena was opened as they was like maybe more then 5 or so goblins cant remember how many there are use your ice spell after you gather them up or use a spell that is a aoe spell with goblins