The wild symbol on the first reel (one or more goblins) multiplies winning combinations by the number of goblins appearing on the symbol. The wild on the 5th reel, a treasure chest, does not have a multiplier.
Free spins are triggered when the goblin(s) symbol shows up on the first reel, and the treasure chest lands on the 5th reel. You are awarded 15 free spins with a multiplier equal to the number of goblins appearing on the wild symbol when the feature was triggered. Free spins can be retriggered, 10 more free spins are awarded at the same multiplier.
I gave this slot a quick try and it was pretty fun. You can see where some good wins can happen during free spins. If you trigger free spins with 5 goblins appearing on the symbol, and then get a nice hit during those free spins with another 5-goblin symbol, your win would be multiplied by 25!
See the screenshots below for paytable info and a decent win of mine on free spins.
Try this great new slot today at any of these RTG casinos!