Two Heads. The ettin marauder has advantage on Wisdom (Perception) checks and on saving throws against being blinded, charmed, deafened, frightened, stunned, and knocked unconscious. 

Twin Reactions. The ettin marauder can take up to two reactions during its turn, but the reactions must be in response to separate triggers

Wakeful. When one of the ettin marauder's heads is asleep, its other head is awake.

Multiattack. The ettin marauder makes two attacks: one with its battleaxe and one with its morningstar; or two with rocks.

Battleaxe. Melee Weapon Attack: +8 to hit, reach 10 ft., one target. Hit: 14 (2d8 + 5) slashing damage.

Morningstar. Melee Weapon Attack: +8 to hit, reach 10 ft., one target. Hit: 14 (2d8 + 5) piercing damage.

Rock. Ranged Weapon Attack: +8 to hit, range 30/120 ft., one target. Hit: 12 (2d6 + 5)  bludgeoning damage.

Kick. Melee Weapon Attack: +8 to hit, range 5 ft., one target. Hit: 10 (2d4 + 5)  bludgeoning damage.

Shove: The ettin marauder pushes an adjacent opponent of size Medium or smaller; the opponent must succeed at a DC 18 Strength saving throw or be moved 10 feet away from the ettin.​

Swat. If an opponent makes an action while adjacent to the ettin marauder, the ettin can use shove against that opponent.​