From Destinypedia, the Destiny wiki
Falling Guillotine is popular amongst the playerbase for being able to do large amounts of damage against bosses and "swarm", type enemies like Thralls, Shanks, War Beasts and Taken Psions. This is due to the intrinsic perk, Vortex Frame, which allows for a heavy spin attack that decimates low-level enemies. A Falling Guillotine that has the perks Whirlwind Blade, Swordmaster's Guard, Jagged Edge and Relentless Strikes is considered a god-roll, as it can shred bosses in minutes.
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