Loyalty's Wrath

Loyalty's Wrath is a masterwork longsword forged by Algernon Longmark for his daughter Alethra. After The Emerald Lily Pad fought and defeated the Foerender, Alethra came into possession of his axe; Wrath of the Mountain Father. Rather than give up her beloved blade, she had the magic transferred from the legendary axe to her sword, which caused it to take on an icy appearance.

Abilities
The wielder gains +3 to their attack and damage rolls with this weapon and deals an additional 2d4 cold damage on hit. It has the following additional effects:

One With the Mountain
While attuned to this weapon the wielder is immune to the effects of extreme cold and has resistance to cold damage. In addition, when they are hit by cold damage they can expend 1 charge to roll a d20. On a 10 or above Loyalty's Wrath absorbs any damage they would have received and deals that much damage in addition to its normal damage on a successful hit on the wielder's next turn.

Avalanche
The wielder can expend 3 charges to cast  Cone of Cold  as an action. Strength is the spellcasting modifier for this action.

Charges
Loyalty's Wrath has 5 charges under normal temperatures (1 - 25 degrees), 10 charges in cold temperatures (1> degrees) and 3 charges in hot temperatures (25< degrees). It regains its charges at midnight.

Weapon Bond
Due to her training as an Eldritch Knight, Loyalty's Wrath is bonded to Alethra. She can't be disarmed of the sword and as long as they are on the same plane of existence she can summon it into her hand as a bonus action.