Alatreon

Legendary Resistance (3/Day). If the alatreon fails a saving throw, it can choose to succeed instead.

Multiattack. The alatreon makes one Claw attack, one Gore attack, and one Tail attack. Alternatively, the alatreon makes two Elemental Blast attacks.

Claw. Melee Weapon Attack: +15 to hit, reach 5 ft., one target. Hit: 16 (2d8 + 7) slashing damage plus 4 (1d8) lightning damage.

Gore. Melee Weapon Attack: +15 to hit, reach 10 ft., one target. Hit: 14 (2d6 + 7) piercing damage. If the alatreon moved at least 10 feet straight toward the target immediately before the hit, the target takes an extra 10 (3d6) piercing damage. If the target is a creature, it must succeed on a DC 23 Strength saving throw or be knocked prone.

Tail. Melee Weapon Attack: +15 to hit, reach 15 ft., one target. Hit: 16 (2d8 + 7) bludgeoning damage.

Elemental Blast. Melee Weapon Attack: +15 to hit, range 120 ft., one target. Hit: 13 (3d8) fire damage (Fire Element Only) or cold damage (Ice Element Only).

Breath Weapons (Recharge 5–6). The alatreon uses one of the following breath weapons:

Fire Breath (Fire Element Only). The alatreon exhales fire in a 90-foot long, 5-foot wide line. Each creature in that area must make a DC 23 Dexterity saving throw, taking 91 (26d6) fire damage on a failed save, or half as much damage on a successful one.

Ice Breath (Ice Element Only). The alatreon exhales an icy blast in a 60-foot cone. Each creature in that area must make a DC 23 Constitution saving throw, taking 91 (26d6) cold damage on a failed save, or half as much damage on a successful one.

Elemental Shift (Recharge 6). The alatreon shifts between the following elements. The alatreon can't shift to the element it is already in. Each time the alatreon shifts element, it gains 35 (10d6) temporary hit points.

Fire Element. The alatreon has the following features while in this element:

• The alatreon has immunity to fire damage, and vulnerability to cold damage.
• The alatreon's Gore attack deals an additional 7 (2d6) fire damage.
• Each creature that starts its turn within 10 feet of the alatreon takes 7 (2d6) fire damage.

Ice Element. The alatreon has the following features while in this element:

• The alatreon has immunity to cold damage, and vulnerability to fire damage.
• The alatreon's Gore attack deals an additional 7 (2d6) cold damage.
• Each creature that starts its turn within 20 feet of the alatreon must succeed on a DC 23 Constitution saving throw or have its movement speed reduced by 10 feet until the start of its next turn.

The alatreon can take 3 legendary actions, choosing from the options below. Only one legendary action option can be used at a time and only at the end of another creature's turn. The alatreon regains spent legendary actions at the start of its turn.

Attack. The alatreon makes one Tail or Elemental Blast attack.

Lightning Surge (Costs 2 Actions). The alatreon calls down lightning bolts to strike down around it. Up to four creatures the alatreon can see within 60 feet of it must succeed on a DC 23 Dexterity saving throw or take 27 (6d8) lightning damage.

Explosive Flame (Costs 3 Actions; Fire Element Only). The alatreon exhales a burst of flame at a point it can see within 90 feet of it that explodes in 30-foot radius sphere. Each creature in that area must make a DC 23 Dexterity saving throw, taking 42 (12d6) fire damage on a failed save, or half as much damage on a successful one.

Glacial Spikes (Costs 3 Actions; Ice Element Only). The alatreon causes three 5-foot radius, 20-foot tall cylinder spikes of ice to emerge from the ground at points it can see within 90 feet of it. Each creature within a spike's area when it appears must succeed on a DC 23 Dexterity saving throw or take 22 (5d8) piercing damage plus 22 (5d8) cold damage. Each spike remains until the start of the alatreon's next turn.