Audhulma {Sacred Twin of Jehenna}

Frost Enchantment. The blade of this sword is said to resemble a pristine icicle. When you hit with an attack using this magic sword, the target takes an extra 1d10 cold damage. In addition, while you hold the sword, you have resistance to fire damage, and immunity to cold damage. In freezing temperatures, the blade sheds bright light in a 10-foot radius and dim light for an additional 10 feet.

Arctic Winds. When you draw this weapon, you can extinguish all nonmagical flames within 30 feet of you. This property can be used no more than once per hour.

Blessing of Ice. In addition, when you take cold damage - you can use a special reaction once per day, to give yourself immunity to that instance of cold damage. This ability refreshes after a long rest.

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This legendary item was used in battle in the world of Magvel, where Prince Joshua of Jehenna took up his countries Sacred Twin Relic against the Demon King, Formortiis. This weapon was later held for safekeeping by the sage known as Brammimond, otherwise known as Cameron the Clairvoyant.
This magic item was created by the magi of wonder and whimsy; Cameron the Clairvoyant. He loved to create, and was inspired by many things around him - Fire Emblem, people, places, things, concepts, nature, anime, pop culture - and loved to craft superior unique things for the Dungeons and Dragons community. Check out his homebrew creations in every category on D&DBeyond, and feel free to incorporate them into your homebrew campaigns. Cameron the Clairvoyant is a former player-character that reached level 20 and now functions as a NPC Archwizard, and has created numerous impactful magic items, weapons, subclasses, monsters, creatures, feats and spells. Seek him out in your next quest! He loves to take requests and interact with parties of player-adventurers.

Proficiency with a Longsword allows you to add your proficiency bonus to the attack roll for any attack you make with it.

Notes: Resistance: Fire, Immunity: Cold, Bonus: Magic, Damage: Cold, a creature with proficiency in both martial and simple weapons, Damage, Combat, Warding, Versatile, Sap