Archen Gorgon

Trampling Charge. If the gorgon moves at least 20 feet straight toward a creature and then hits it with a gore attack on the same turn, that target must succeed on a DC 16 Strength saving throw or be knocked prone. If the target is prone, the gorgon can make one attack with its hooves against it as a bonus action.

Mana Surge. The Archen Gorgon infuses its body with mana. This effect activates passively when the Archen Gorgon reaches half its maximum hit points. While active, the Archen Gorgon deals an extra d6 force damage with its attacks, uses its Mana Breath once without the need to recharge, and can act twice for the rest of the fight.

Archen Crystal. Within the Archen Gorgon's mouth is a crystallized piece of mana which powers its attacks. The Archen Gorgon's mouth is closed to defend its mouth, but there are weakened plates that can be noticed with a passive perception of 14 or higher. An Arcana check (DC 13) also reveals this. Attempting to open the mouth by attacking the plates requires a DC 15 check, depending on the attack used. If the mouth is fully open, the next turn it closes.

Gore. Melee Weapon Attack: +8 to hit, reach 5 ft., one target. Hit: 18 (2d12 + 5) piercing damage.

Hooves. Melee Weapon Attack: +8 to hit, reach 5 ft., one target. Hit: 16 (2d10 + 5) bludgeoning damage.

Mana Breath (Recharge 5–6). The Archen Gorgon exhales supercharged mana in a 30-foot cone. Each creature in the area must succeed on a DC 14 Wisdom saving throw or suffer 3d6 force damage and become stunned at the end of its next turn. A target affected by this attack suffers 2d4 damage at the start of their turn, and can repeat the saving throw to become free. This effect lasts for two rounds, but can end early when the target is hit by any magical attack.