Skull Heart (Skullgirls)

The Skull Heart is a powerful sentient artifact that plays a major part in the Skullgirls story. Every seven years after its previous destruction, it reappears to grant a wish to a woman. The wish can be of incredible magnitude, but it comes at a great price. The Skull Heart often twists even selfless wishes into brutality, ending wars by causing even more destruction, bringing back a loved one as an undead minion, and in return inhabits the body of the woman who wished upon it, in time turning the woman into a Skullgirl. A murderous, extremely powerful woman corrupted by the Skull Heart, capable of raising corpses as mindless minions, bringing about destruction in an endless cycle with the purpose of one day ending the world.

In When the Cold Breeze Blows Away, it would be secret artifact to making the woman become a Skullgirl that it would make the woman to be either evil or good

But to Global Liberation Union, the Belkan Grey Men take it and puted it into the inside of a damaged PETAI into their superweapon : Battle Space Skull Emperor XXL.