It was trapped inside an enchanted chunk of ice by the Frost Giants, and was hidden in Finland until its owners needed its powers again.
Life Extension: Beings who regularly absorb the energy of the Crystal become potentially immortal;
Immense Energy: The Crystal can feed tens of Frost Giants with its magic before needing to recharge;
Glowing: Whenever its name is said, the Angrboda Crystal will glow blue
Symbiosis: It can enter the chest of creatures that tap into its power. This will mean no harm or benefit to humans, as the Crystal will be expelled from their bodies a few days after the fusion.