User blog comment:Crimson and Darkness/Shin DxD 4 discussion/@comment-78.10.210.206-20200219175634/@comment-40183495-20200220142913

Dragons are embodiment of power. Powerful dragons should be able to revive as long as their soul isn't destroyed, or not at least not damaged too much. They can also use extern things, such as Sephiroth Graal, to speed up the process.