Where does the Claire Doubles board drop?

[Shazbot]

I've a burning desire to make one. If only I knew where to hunt it though...

[Lyrise]

Linear Line, part 1, S level. You have to kill those megid-spitting freaks for it though (Deljabans).

[Vhex]

Wrong. Mad Creatures A, Kovalta. I got one.

[Thrash777]

Y'kno, Lyrise could be right as well... items can be dropped in more than one place by more than one enemy...

[Itsuki]

Vhex is just stupid. Hes thinking twin Claires replicas (7star twin saber) instead of real claire doubles (10 star double saber).

The ONLY place claire double boards drop is linear line part 1 S.