OGC:Black Icer (5e Creature)
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Large ooze, unaligned
Damage Vulnerabilities acid, fire
Amorphous. The black icer can move through a space a narrow as 1 inch wide without squeezing.
Slick Surface. Black icers have extremely slick surfaces when hardened. Any creature stepping on a black icer must make a DC 15 Dexterity saving throw or slip and fall on top of the black icer. The black icer may engulf the creature as a reaction.
Transparent. Black icers are difficult to see when on a smooth surface and even when they settle into a patch of “ice” on natural ground they look no different than regular ice. Even when in plain sight, it takes a successful DC 17 Wisdom (Perception) check to spot a black icer that has neither moved nor attacked. A creature that tries to enter the black icer’s space while unaware of the black icer is surprised by the black icer.
Pseudopod. Melee Weapon Attack: +5 to hit, reach 5 ft., one creature. Hit: 10 (3d6) cold damage.
Engulf. The black icer moves up to its speed. While doing so, it can enter Large or smaller creatures’ spaces. Whenever the black icer enters a creature’s space, the creature must make a DC 15 Dexterity saving throw. On a successful save, the creature does not slip and may enter the nearest 5-foot space outside of the black icer’s spaces. On a failed save, the creature takes 10 (3d6) cold damage and is engulfed.