Agresssive. As a bonus action, the  outrider can move up to its speed toward a hostile creature that it can see.

Invisibility. The outrider magically turns invisible until it attacks

Limited Telepathy. Using telepathy, the outrider can magically communicate with any other outrider dragon within 60 feet of it.

Pack Tactics. The outrider has advantage on an attack roll against a creature if at least one of the outrider's allies is within 5 feet of the creature and the ally isn't incapacitated.

Multiattack. The  outrider makes 5 attacks: four with its claws and one with its mouth.

Claw. Melee Weapon Attack: +5 to hit, reach 5 ft., one target. Hit: 9 (2d4 + 5) [slashing] damage. 

Bite. Melee Weapon Attack: +5 to hit, reach 5 ft., one target. Hit: 9 (1d8 + 5) piercing] damage. 

Enter the description for how legendary actions work for your monster here.

Legendary Action Name (Costs # Actions). Enter the description for your legendary action.