Not quite as impressive as Desire's A/E, but I believe this is the other one he was using right at the end to solo Chkkr Locust Lord and Reefclaw Ragebound. It works on any melee/ranger boss which :
a) you can lure away from their group (Mantis Bosses)
b) have an escort consisting of predominantly attackers.
Skills:
Critical Eye
Critical Defenses
Way of Perfection
Flashing Blades
Wild Blow
Golden Phoenix Strike
Critical Strike
Blinding Powder
Attributes:
12+1+2 Dagger
11+2 Critical Strikes
6+1 Shadow Arts
Usage:
Imcredibly simple. Just lure your boss away from his patrol (ie when there are no other mobs around him), put up your enchantments, and spam your attacks.
Credits:
This was in Desire's video along with his other build, but the idea has been around for ages.
Bosses it will work on:
Chkkr Locust Lord
Chkkr Thousand Tail
Reefclaw Ragebound
A/W Solo Green Farmer
around