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Divine White Dragon's Wrath.
One of Drake's many Skills, and also one of the strongest Skills he had acquired from defeating Bestellen and eating both his Soul and his Dragon Heart.
By assimilating his Divine Dragon Flesh, Blood, and even his Soul, Blake had acquired a tremendous new draconic form, and this Skill was born from it.
However, this powerful Skill, which he had also shared with Emilia was rather powerful, it required him to be severely damaged to be activated.
Indeed, his Health had to drop below 90%!
It would simply be impossible to get this far within a robot, most of the time. However, because he and Bravelion were connected as a single being, the more Bravelion was damaged, the more his "Health" went down.
Therefore, the Skill could be activated, similarly to how Emilia was able to do it as well!