Ares

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

Multiattack. Ares can use its Frightful Presence. It then makes three attacks: Two with its spear and one with its shield.

Ares Spear. Melee Weapon Attack: +13 to hit, reach 15 ft., one target. Hit: 21 (2d10 + 10) piercing damage plus 14 (2d8) fire damage.

Shield bash Melee Weapon Attack: +10 to hit, reach 10 ft., one target. Hit: 17 (2d6 + 10) bludgeoning damage and push the target 15 feet back. 

Frightful Presence. Each creature of Ares choice that is within 120 feet of Ares and aware of him must succeed on a DC 18 Wisdom saving throw or become frightened for 1 minute. A creature can repeat the saving throw at the end of each of its turns, ending the effect on itself on a success. If a creature's saving throw is successful or the effect ends for it, the creature is immune to Ares Frightful Presence for the next 24 hours.

Fire quake (Recharge 5–6). Ares exples fire in a 30 area centered on him. Each creature in that area must make a DC 21 Dexterity saving throw, taking (15d6) fire damage on a failed save, or half as much damage on a successful one.

Ares 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. Ares regains spent legendary actions at the start of its turn.

Spear Lunge. 20 foot range. Ares makes a jumping attack. 

Jump. Ares leaps into the air causing all characters to be knocked prone in a 30 foot area. 

Sheild lock increases AC. +3 to Ac for one round.