The devil magically forms an opaque wall of ice on a solid surface it can see within 60 feet of it. The wall is 1 foot thick and up to 30 feet long and 10 feet high, or it's a hemispherical dome up to 20 feet in diameter.

Ice Devil (Gelugon) Found most commonly on the cold layers of Stygia and Cania, ice devils serve as commanders of the infernal armies of the Nine Hells, tormenting lesser devils as an outlet for their anger and resentment.

Bel magically summons an ice devil with an ice spear (as described in the ice devil's entry in the Monster Manual). The ice devil appears in an unoccupied space within 60 feet of Bel, acts as Bel's ally, and can summon other devils if it has such power.

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.

A hail of rock-hard ice pounds to the ground in a 20-foot-radius, 40-foot-high cylinder centered on a point within range. Each creature in the cylinder must make a Dexterity saving throw. A creature takes 2d8 bludgeoning damage and 4d6 cold damage on a failed save, or half as much damage on a successful one.

A humanoid-shaped block of ice lumbers forward on angular legs. Visitors from Polar Portals. Remote polar regions possess their own entrances to the demiplane of ice. Ice elementals emerge from the core of ancient glaciers or rise from foot-thick patches of permafrost.

A hail of rock-hard ice pounds to the ground in a 20-foot-radius, 40-foot-high cylinder centered on a point within range. Each creature in the cylinder must make a Dexterity saving throw. A creature takes 2d8 bludgeoning damage and 4d6 cold damage on a failed save, or half as much damage on a successful one.

Wall of Ice: The devil magically forms an opaque wall of ice on a solid surface it can see within 60 feet of it. The wall is 1 foot thick and up to 30 feet long and 10 feet high, or it's a hemispherical dome up to 20 feet in diameter.

An ornate block of ice carved into an ancient holy symbol. The carving has a subtle taint of magic to it, but it's not exactly clear what prevents it from melting.

Ice Devil [–] Devil of Antipathy and Intellectual Arrogance. Habitat: Planar (Nine Hells) Treasure: Arcana. Heartless strategists of the Nine Hells, ice devils—also known as gelugons—forsake emotion to indulge in their own malicious interpretations of logic.