True Ice

True Ice is a magical ice that could only be created by the Yeti and the magic given to them by Anivia. A very rare mineral, it is so cold that it can never be melted. Only those known as Iceborn are able to manipulate said mineral. A variant of True Ice that was corrupted by The Void exists in the form of Dark Ice.

True ice can be cut, shaped, and sculpted, but not easily, and few have the skills and tools to do the work anymore. Master smiths, those few men that are favored by

Ornn, have managed to craft this strange substance into powerful weapons and armor. Only Iceborn warriors can stand its freezing touch and may wield it in battle. It serves as a powerful multiplier for their power. Non-Iceborn may die from contact with True Ice.

True Ice's crystalline structure seemingly can change, owing to in-universe thermochemical processes, producing various allotropes to make different weapons: from Avarosa's elastic bow to Trundle's rigid club; much like real-life carbon, whose two best-known allotropes are the soft graphite and the hard & brittle diamond. It's more common for an Iceborn to attach a tiny shard to a weapon.