Insidion

Insidion is a black dragon that flies over Bash'ir Landing and the Crystal Spine. Be very careful around Insidion - if he detects you he will spit a fireball at you. (~3000 damage)

As of patch 2.4.2 the dragons in Blade’s Edge Mountains will no longer instantly knock you off your flying mount.

Loot
He drops the Insidion's Ebony Scale.