Crissaegrim (5e Equipment)
From D&D Wiki
Weapon (longsword), legendary (any chaotic alignment)
A black, slender blade, belying its true power of ferocity, dubbed "Lords of Shadow." It is wielded by a legendary vampire, forged from the power of ice and fire from the depths of hell, and the killer of the beautiful vampiress Carmilla.
Vampire Killer. You gain a +1 bonus to attack and damage rolls made with this magic weapon. When you hit an undead with this weapon, the undead takes an extra 3d6 damage of the weapon's type.
Glaciem Remnant. This sword has 10 charges. When you successfully attack a creature with this weapon, you may expend a charge to freeze the target. They are considered paralyzed until the end of their next turn.
Void Power. When you successfully strike a creature with this weapon, you can possibly siphon some of their power to replenish your own. Roll a d6. On a roll of 4-6, the Crissaegrim regains one charge.
Igneas Remnant. You may expend 3 charges to have this weapon ignore all armor bonuses for 1 minute. Additionally, you have advantage on attack rolls against creatures wearing metal armor. Creatures wearing metal armor take an extra 2d8 fire damage on a hit and have disadvantage on saving throws and ability checks until the start of your next turn.