Oh Deer!
Kurek is a merchant for the goblin clans. He is having a problem with some fake embers he bought from another merchant.
Turns out, the ember he was sold was tainted and made his deer go insane. Offer to help him.
Make it all the way to the back and clear the place of all deer you come across.
The deer aren't tough but cast poison a lot in an area.
After dealing with them, speak to Kurek to submit the side-quest.