The cursed energies work different than all other Divination
energies, these can be converted to other energies. The amount of energy you receive varies on the player's Divination level. Levels 1-54 gain 1 energy, Levels 55-74 gain 2 energy, Levels 75-99 gain 3 energy upon siphoning from a cursed wisp.
You can trade these to other players, but you cannot buy them via the Grand Exchange.
Be warned, a player who has this item in their inventory will be unable to teleport out of the Wilderness, as well as allow anyone in the wilderness to attack them.
A chunk of harvested divine energy. It can be manipulated to create various energies.