JKSManga
Such an interesting development!! I would have never thought the Demon Kings (or any demon) had a demon transformation because I thought they were already transformed. And for Quinn to have been forced to transform, this doesn't bode well for the Skully's or Quinn (without external healing he took 6 months to recover).
Oh this is a nice surprise if the demon kings being equal to Immortui is based on them using demon form then Quinn who is stronger in his base should be that much stronger in his demon form as well. Looks like he is getting a forced activation this doesn't bold well for the Skully Quinn was warned not to use it unless he wants to kill everything on the planet.