Keen Smell. The onyx deer has advantage on Wisdom (Perception) checks that rely on smell.

Onyx Bite. Creatures bitten by an onyx deer must succeed on a Constitution saving throw or slowly begin to turn into onyx (included in the attack).

Actions

Multiattack. The onyx deer makes four attacks: one bite, one gore, and two with its hooves.

Bite. Melee Weapon Attack: +6 to hit, reach 5 ft., one target. Hit: 8 (1d8 + 4) piercing damage and the creature must make a DC 14 Constitution saving throw. On a failed save, the creature magically begins to turn to onyx and is restrained. It must repeat the saving throw at the end of its next turn. On a success, the effect ends. On a failure, the creature is petrified in onyx until freed by a greater restoration spell or other magic.

Gore. Melee Weapon Attack: +6 to hit, reach 5 ft., one target. Hit: 9 (1d10 + 4) piercing damage.

Hooves. Melee Weapon Attack: +6 to hit, reach 5 ft., one target. Hit: 7 (1d6 + 4) slashing damage.

Bellow (Recharge 5–6). The onyx deer unleashes a rumbling bellow. Each creature that is within 60 feet of the onyx deer and able to hear it must succeed on a DC 14 Wisdom saving throw or be frightened for 1 minute. The frightened creature can repeat the saving throw at the end of each of its turns, ending the effect on itself on a success.

large

monstrosity

cr4

tome-of-horrors

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