Weapon (Morningstar), Rare (Requires Attunement)
A dark metal weapon frozen over with sharp icicles. You gain a +1 bonus to attack rolls made with this magic weapon. While attuned to this weapon, you are considered proficient with it.
Grasping Frost. You can use a bonus action to speak this magic weapon’s command word, causing icicles to grow from it which last for 1 hour. For the duration, this weapon is treated as a maul and deals an extra 1d8 cold damage on a hit. Once you use this property, it can’t be used again until you finish a short or long rest.
You can end this property early as an action by having the icicles erupt in an explosion of frost. Each creature within 20 feet of you must make a DC 15 Constitution saving throw. On a failed save, a creature takes 3d8 cold damage and is hindered by ice formations for 1 minute, or until it or another creature within reach of it uses an action to break away the ice. A creature hindered by ice has its speed reduced to 0. On a successful save, a creature takes half as much damage and isn’t hindered by ice.
Very Rare Variant. The DC of Grasping Frost property is increased to 17. If a creature is hindered by ice from the Grasping Frost property, any attack that hits it is a critical hit if the attacker is within 5 feet of the creature. Afterwards, the creature is no longer hindered by ice.
The cold shows no mercy; spare none for your enemies.