Crystal Elk

Trampling Charge. If the Crystal Elk moves at least 20 ft. straight toward a target and then hits it with an Antler attack on the same turn, the target takes an extra 11 (2d10) piercing damage. If the target is a creature, it must succeed on a DC 15 Strength saving throw or be knocked prone. If the target is prone, the Crystal Elk can make another Antler attack against it as a bonus action.

Radiant Aura. If a creature with resistance to radiant damage is within a 10 ft. sphere of the Crystal Elk, then their resistance reduces radiant damage taken by a quarter instead of half.

Soothing Pulse. Any 6 creatures that the Crystal Elk chooses within a 10 ft. sphere of the Crystal Elk (including itself) heals 13 (2d12) hit points at the start of each of its turns.

Illumination. The Crystal Elk sheds bright light in a 10 ft. radius and dim light in an additional 10 ft. radius.

Multiattack. The Crystal Elk makes two attacks.

Antlers. Melee Weapon Attack: +4 to hit, reach 5 ft., one target. Hit: 8 (2d6 + 1) piercing damage and 21 (5d6 + 4) radiant damage.