What is Thunderlash?

LittleBlackSmurf Profile Options #1

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On the Disc Queen's Heart the first attribute that all Disc's have is Thunderlash, is this a special passive on the weapon? What does it do?
Yosha Profile Options #2

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5
Prime
Yosha Lvl.60
Tempest Reach (PVE)
Elin Sorcerer
Thunderlash has a chance to place a debuff on the enemy. It's damage over time that does 3710 dmg every 2 seconds up to 6 seconds.

Every Regent weapon has this effect that drops from Manaya's Core hard mode.