Boy this is like a worse developed copy of ubel blatt. If it were to copy UB, but only cut out most of the porn it would have been better, because thats what made UB pretty terrible to read.
Making him immortal tho already kills all the tension and the battle scenes are pretty bad as it never shows any hits just flash forwards with damage dealt at a later point and inconsistent power as hes shown to die early to a lower dragon then proceeds to kill 20 that bothered me personally alot.