Urstrylox

Danger Sense. The Urstrylox has advantage on Dexterity saving throws against effects that it can hear, see or smell such as traps and spells. To gain this benefit, it can’t be blinded, deafened, or incapacitated.

Flyby. The Urstrylox doesn't provoke opportunity attacks when it flies out of an enemy's reach.

Keen Senses. The Urstrylox has advantage on Wisdom (Perception) checks that rely on hearing, sight and smell.

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

Magic Resistance. The Urstrylox has advantage on saving throws against spells and other magical effects.

Regeneration. The Urstrylox regains 20 hit points at the start of its turn if it has at least 1 hit point. If the Urstrylox takes necrotic damage, this trait doesn’t function at the start of the Urstrylox’s next turn.

Silent Flyer. The Urstrylox has advantage on Dexterity (Stealth) checks that rely on moving silently while flying.

Relentless. The Urstrylox has resistance to being restrained, grappled or knocked prone unless unconscious or incapacitated.

Earth Armor (Recharge 4-6). The Urstrylox creates an armor around itself formed of the earth and stone around it. The Urstrylox has resistance to nonmagical bludgeoning, piercing, and slashing damage and it's AC becomes 18. This effect ends after the Urstrylox receives damage from an attack.

Ember (Recharge 4-6). The Urstrylox whips it's tail and a thin sheet of flames shoots forth. Each creature in a 15-foot cone must make a Dexterity saving throw. A creature takes 4d6 fire damage on a failed save, or half as much damage on a successful one.

The fire ignites any flammable objects in the area that aren't being worn or carried.

Gale (Recharge 4-6). The Urstrylox beats it's wings to create a line of strong wind 60 feet long and 30 feet wide that blasts from it in any direction. Each creature in the line must succeed on a Strength saving throw or be pushed 15 feet away from it in a direction following the line.

The gale disperses gas or vapor, and it extinguishes candles, torches, and similar unprotected flames in the area. It causes protected flames, such as those of lanterns, to dance wildly and has a 50 percent chance to extinguish them.

Wing Attack (Recharge 4-6). The Urstrylox beats its wings. Each creature within 10 feet of the Urstrylox must succeed on a DC 15 Dexterity saving throw or take 12 (2d6 + 5) bludgeoning damage and must succeed on a DC 15 Constitution saving throw or be stunned until the end of its next turn. The Urstrylox can then fly up to half its flying speed.

Multiattack. The Urstrylox makes three melee attacks.

Bite. Melee Weapon Attack: +10 to hit, reach 5 ft., one target. Hit: 16 (2d10 + 5) piercing damage. If the Urstrylox moved at least 20 feet straight toward the target immediately before the hit and the target is a Large or smaller creature, the target must succeed on a DC 15 Strength saving throw or be restrained.

Crushing Claws. Melee Weapon Attack: +10 to hit, reach 5 ft., one target. Hit: 16 (2d10 + 5) slashing damage. If the target is a Large or smaller creature, the target must succeed on a DC 15 Strength saving throw or be knocked prone.

Frightening Screech (Recharge 4–6). The Urstrylox screeches. Each creature within 30 feet of it that can hear it must succeed on a DC 15 Wisdom saving throw or be frightened of it for 1 minute. The frightened creature can repeat the saving throw at the end of each of its turns, ending the effect on itself on a success.

Primal Split (Recharge 4–6). The Urstrylox splits into 3 primal spirits. Cave bear (earth), fox (fire) and giant owl (air). Each form has the same stats as its normal counterpart, except it keeps it's elemental abilities and it performs actions independently. The Urstrylox can revert to it's normal form earlier by using a bonus action on it's turn. It automatically reverts if all 3 primal spirits fall unconscious, drop to 0 hit points, or die.

Vulpine Nimbleness. The Urstrylox takes the Dash or Disengage action.

Stone’s Endurance (Recharge 4-6). When the Urstrylox takes damage, it reduces the damage taken by 12 (1d12 + 5).

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

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

Earth Armor (Costs 2 Actions). The Urstrylox uses Earth Armor.

Ember (Costs 2 Actions). The Urstrylox uses Ember.

Frightening Screech (Costs 2 Actions). The Urstrylox uses Frightening Screech.

Gale (Costs 2 Actions). The Urstrylox uses Gale.

Primal Split (Costs 2 Actions).  The Urstrylox uses Primal Split.

Wing Attack (Costs 2 Actions). The Urstrylox use Wing Attack.