Multiattack. The guardian can use its Roar and makes two slam attacks. It can also make a stomp attack in place of the slam attacks.

Slam. Melee Weapon Attack: +5 to hit, reach 5 ft., one target. Hit: 10 (2d6 + 3) bludgeoning damage

Roar. The guardian targets one creature it can see within 60 feet of it. If the target can see the guardian, it must succeed on a DC 11 Wisdom saving throw against this magic or become frightened until the end of the guardian’s next turn. If the target fails the saving throw by 5 or more, it is also paralyzed for the same duration. A target that succeeds on the saving throw is immune to the Roar for the next 24 hours.

Stomp. The guardian stomps. All enemies within 15 feet must succeed on a DC 12 Dex save or take 10 damage and be knocked prone. Successful save is 1/2 damage and not prone.