[Frozen Norse] Isjfel, Ring of Icebergs (Patreon)

Ring, very rare

Crafted in the Frozen Forge, this ring is capable of entombing its wearer in a protective iceberg, or isfjell as it is known in the Giant tongue. Such rings are found in all sizes; a ring crafted for a giant might be worn as a torc by Loic Giantslayer, or as a belt by Mitji the Tiny. This is due, in part, to the wisps of water vapour that run between the ring’s jagged ends and its geodesic jewel, allowing it to expand and accommodate most digits.

Isfjell. As a reaction to being hit by an attacker you can see, or as a bonus action, you can spin the ring’s jewel causing it to expand into a hollow block of clear ice that completely surrounds you. This breaks any grapples in which you are involved. The iceberg occupies your space and creatures can’t pass through it. The iceberg has the capacity for one creature of your size; there is enough space within the iceberg to turn around, but you can’t move more than 6 inches in any direction. Spells and other magical effects can't extend through the iceberg or be cast through it.

The iceberg has 100 hit points, which takes as much of any triggering damage as possible. The iceberg has immunity to cold, poison, and psychic damage, and vulnerability to fire damage. It automatically fails Dexterity saving throws. The icey tomb lasts for up to 1 minute, until it is destroyed, or until you use a bonus action to cease the jewel’s spinning, whichever comes first.

Once you use this feature, you can’t do so again until the ring spends 8 hours in snow, ice, or cold water.

Optional Attunement. If you attune to the ring, you gain resistance to cold damage.

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