The Portal of Souls is used to sacrifice captured creatures' souls in order to obtain more powerful ones. Place the cards with the souls of the creatures you want to sacrifice on the altar and tap "Sacrifice" button.
Rarity Points[]
Each rarity level is worth a certain amount of points:
Common creatures are worth 1 point
Uncommon creatures are worth 5 points
Rare creatures are worth 25 points- Epic creatures are worth 125 points
Rare creatures are worth 25 points
Epic creatures are worth 125 points
Legendary and 
Unique are not usable.
Costs[]
- 1 = 5 points
- 1 = 25 points
- 1 = 125 points
- 1 = 625 points
Every sacrifice costs a certain number of 
coins. The more souls you are about to sacrifice, the higher is the price.