Four-Claw Dragon

"Drink this, Flying Flame," Abel handed a soul potion to Flying Flame. He didn't have to order it since it opened its large mouth the moment he took out the bottle. It knew how good the liquid was.

When the entire bottle of the potion went inside Flying Flame's mouth, its eyes started to look hollow. The grey scales on its body became a little darker and after thirty seconds, it started waking up. The effect of the potion was over. 

Abel took out another bottle to feed it. He didn't know how many he needed to make a real change, but since he had a total of thirty-something bottles, he could always just keep feeding it more before any real change started happening. Besides, he could also get more soul potions by killing the hell creatures in Black Marsh. 

Again, it took Flying Flame thirty seconds to fully absorb the second "soul potion." The change was still very subtle. Its scales just became darker. There wasn't much else other than that.