Multiattack

The rubezahl makes one gore attack and two claw attacks.

Claw

Melee Weapon Attack: +9 to hit, reach 5 ft., one target. Hit: 15 (3d6 + 5) slashing damage.

Gore

Melee Weapon Attack: +9 to hit, reach 5 ft., one target. Hit: 18 (3d8 + 5) piercing damage and a target creature must succeed on a DC 15 Strength saving throw or be knocked prone.

Thunderstrike (Recharge 5-6)

The rubezahl calls a sizzling bolt of lightning out of the sky, or from the air if underground or indoors, to strike a point the rubezahl can see within 150 feet. All creatures within 20 feet of the target point take 36 (8d8) lightning damage, or half damage with a successful DC 16 Dexterity saving throw. A creature that fails its saving throw is stunned until the start of the rubezahl's next turn.