As heir to the head of the celestial dragon clan, he was given the mark of the Great Celestial Dragon in the form of dragon seal tattoo. This is the gateway of the celestial dragon in this plane of existence. Through this markings, he can summon the dragon and utilize all of its powers.
He is one of the Keepers of the four corners, which are a consortium of very powerful magewarriors entrusted to protect the realms of the Elementalist, safeguarding peace all throughout the parallel worlds.
This one is my favourite, it looks cool.
Keep on!