The ancient being and the friendship

When Ren was travelling a dark shadowy figure appeared in front of him black hair blue eyes he was a primordial demon... Ren didn't even grasp the situation he instantly got back and said :- WHO ARE YOU WHAT ARE YOUR INTENTIONS!!! (Ren said holding raikoku toward the demon ) 

then suddenly the demon didn't attack he knelt and said my king... so you have returned then suddenly Ren felt something taking over his body the black manda took over half of his body and talked to demon calmly Diablo so you remembered me all this time huh then 

Diablo said :- of course my king I came as soon as I sensed your awakening... then the black mandas expression darkenedn a little and he told Diablo:- Diablo go and wake him up for me after all he has been slacking way too much since my absences Diablo smiled and said :- yes my lord ( he flew to the dragon king zephyron domain)

 Ren asked the black manda where did he sent Diablo the black manda told him :- I sent him to go and bring one of my old friends zephyron Ren panicked and said :- WAIT !!! YOU ARE TELLING ME THAT ZEPHYRON AND YOU WERE ONCE FRIENDS !!! THE DRAGON KING ZEPHYRON THE EMBODIMENT OF LIGHTNING ITSELF !!! THE black manda 

replied ya listen kid( his expression darkened) 

 zephyron might be the only dragon who listens to your peace thing he is a little kid and the most reasonable one his little sister magila the ice queen is a complete mystery but... the real problem is igniris the oldest dragon king and the strongest one at that he will definitely not listen to your peace ... but ... if you defeat him it's 

a different story then far off we see Diablo in a black castle in the middle of the ocean surrounded by black storms then suddenly a black dragon appeared he suddenly said

 yo Diablo my man how ya doin !! Then Diablo said it's time mister zephyron we must go then zephyron said ( while smiling ) huh ... so that old snake has woken up then suddenly golden aura surrounded zephyron then he transformed into his human form and said okay now let's go and meet my old bud