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De Ragan
From The re-PSUPedia
Plains Overlord Boss.
A massive dragon creature that can fly, trample, and breathe fire.
Its head and wings are its weak points.
When flying high above the ground, it cannot be meleed and a gun is required to hit it.
Here is a photo taken from it's "death scene". The De Ragon is only incapacitated (according to the offline sory) and will wake back up!