Weapon (mace), rare (requires attunement)
When you hit a Celestial, Dragon, or Giant with this magic weapon, that creature takes an extra 2d6 radiant damage. When you attack a creature with this weapon and roll a 20 on the attack roll, that target takes an additional 4d6 slashing damage. Then roll another d20. If you roll a 20 a second time, you lop off one of the target’s limbs, with the effect of such loss determined by the GM. If the creature has no limb to sever, you lop off a portion of its body instead.
Forged by Dwarves, Jarnbjorn is naturally sharper than almost any Earthly weapon, and can cut virtually anything. In addition, Jarnbjorn has a charm placed on it that makes it indestructible, and it can be used to defend against any attack, even bursts of energy like Apocalypse’s optic beam. Thanks to Thor’s own enchantment, Jarnbjorn can pierce the armor of Celestials or created using Celestial technology.