Taliesn
Mirriana's attack creates just the opening Tal's been looking for! In a fury of spinning claws, he flies up and down the monstrosity's back like a dancing mongoose!
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. . . Because maneuvers come with descriptive names, obviously.
By this point, Tal should be flanking with somebody, if this thing is flankable, but just in case, I haven't added the +2 to to-hit. Please add if applicable.
Also, at this point, Tal's transmuting weapon property is active, so he penetrates any DR (except, I suppose, epic).
Move action to jump - (1d20+41)[54] and tumble - (1d20+26)[31]
Swift action for Dancing Mongoose, giving 2 extra attacks at top BAB:
claw - (1d20+27)[42] [roll=damage]2d6+16[roll]
claw - (1d20+27)[36] [roll=damage]2d6+16[roll]
claw - (1d20+27)[43] [roll=damage]2d6+16[roll]
claw - (1d20+27)[37] [roll=damage]2d6+16[roll]
claw - (1d20+27)[37] [roll=damage]2d6+16[roll]
claw - (1d20+27)[40] [roll=damage]2d6+16[roll]
And again, damage is doubled by rending from Tal's giralon arms bind if two or more claws hit.
EDIT: and of course I screwed up the damage rolls. Re-done in OOC.