In the Tower of Lost Souls mode on the Ascend path, a skeleton appears using this fighting style on the challenge "Irritation to Ruin" as a boss and a fairly easy opponent to beat if you can exploit Raphael's fighting style and the holes in the AI.
Tower of Lost Souls Details & Skills[]
TOLS Ascend Floor Challenge: Irritation to Ruin (Floor 41)
Partner(s): Skeleton & Skeleton
Weapon: Amy
Skills: Venom Fang S
Guard Breaker
Impact Edge