Warforged Dragon

Machined survivability. Does not need to breath, eat or sleep.

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

Multiattack. The dragon can use its Frightful Presence. It then makes three attacks: one with its bite and two with its claws.

Bite. Melee Weapon Attack: +14 to hit, reach 10 ft., one target. Hit: 19 (2d10 + 8) piercing damage.

Claw. Melee Weapon Attack: +14 to hit, reach 5 ft., one target. Hit: 15 (2d6 + 8) slashing damage.

Tail. Melee Weapon Attack: +14 to hit, reach 15 ft., one target. Hit: 17 (2d8 + 8) bludgeoning damage.

Frightful Presence. Each creature of the dragon's choice that is within 120 feet of the dragon and aware of it must succeed on a DC 17 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 the dragon's Frightful Presence for the next 24 hours.

Breath Weapons (Recharge 5–6). The dragon uses one of the following breath weapons all of which have a save DC:17.

Breath Weapons (Options). You roll a d4 and the result determines the breath weapon the dragon uses out of the following breath weapon options.

1. Fire Wall Breath: The warforged dragon sprays ignited oil that acts like the wall of fire spell. (5d8 fire damage from a wall of fire 60 feet long and 20 feet high) (Dex save DC:17) (the dragon does not need to hold concentration and the wall of fire lasts for three rounds or until extinguished)

2. Lightning Breath: The warforged dragon generates a stream of electricity 5 feet wide and 100 feet long dealing 10d6 lightning damage or half as much on a successful save (Dex:17).

3. Poison cloud Breath: The warforged dragon creates a cloud of toxic fumes that is a 25 foot diameter sphere that deals 4d8 poison damage when a creature enters the sphere or starts its turn in the cloud or half as much on a successful save (Con:17). This cloud also obscures vision.

4. Thunderous Roar: The warforged dragon lets out a roar that hits like a shockwave, all creatures in a 30 foot cone must make a strength save or take 5d8 thunder damage or half as much on a successful save (Str:17). If a creature fails the save they are knocked prone.

Detect. The dragon makes a Wisdom (Perception) check.

Opportunity Attack

The dragon 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 dragon regains spent legendary actions at the start of its turn.

Detect. The dragon makes a Wisdom (Perception) check.

Tail Attack. The dragon makes a tail attack.

Wing Attack (Costs 2 Actions). The dragon beats its wings. Each creature within 10 feet of the dragon must succeed on a DC 19 Dexterity saving throw or take 13 (2d6 + 6) bludgeoning damage and be knocked prone. The dragon can then fly up to half its flying speed.