This spell deals a lot of damage over a large area surrounding the caster. This spell is dangerous in PvP worlds, because it has such a large area of effect and could easily lead to a Red Skull or a Black Skull. Causes damage on a total of 73 squares (including the one character is standing on).
Depending upon the caster's Magic Level and Level, this spell can kill strong creatures in one strike.
You can only have one of the two Ultimate spells of your vocation at a time. To change between them, go to Edron and ask Zoltan. He will charge you 500 gold for it. This spell is most used for player killing, if you look at the creatures that this spell can damage well, this spell hasn't much use, if you are hunting, Rage of the Skies is a much better option as you deal almost as good damage, and you can actually deal good damage to much more creatures. For most creatures that require level 60 and give good experience, you will probably go with a team and use Fireball or Great Fireball runes because Hell's Core would be a waste due to its big mana cost, use it as a player killing spell or in a service.