User blog comment:Lord Loss/Monster Appreciation Week: Dire Miralis/@comment-6050823-20131007212021/@comment-6050823-20131007215341

That seems like the most likely case since Dire Miralis was said to have appeared in the Tainted Sea in ancient times and caused much destruction in the area.

Note that this comes from MH3U and MH3G, if you read what the wyvernian says when you get Dire Miralis as an urgent.