So are the younger draconian demons also immortal and sent to the abyss when they die?
Also don’t most dragons attack humans and human demons on sight, so how is it that they progressed to being not outright hostile and became I would guess dangerous if approached incorrectly? Sounds like a great story.
Also wouldn’t dragons be summoned in the same way as demons, and if so how could they be so stupid as to not recognize it, or do whatever the demons come from appear different from demons in the astral plane.