I don't recall that we've ever seen the extra skill "full body, full soul" activated. The devil sensed the attack was dangerous, tried to block it but still got wrecked. From the state of the devil, it seems to have done a lot of damage if not won them the battle. It seems Dogora charged with the intention of sacrificing himself and not coming back and maybe that activated the extra skill because it is one that consumes the user's life. It's hard to imagine that something that has done so much damage doesn't have a high cost. I guess we'll have to see next chapter. Maybe it just takes away all his skills/stars/experience and he'll have to return home. Alan will probably try to negotiate with the gods.