Best place to farm the Nightblade? / Where to farm the Nightblade?

Holaaaaaaso I was just wondering where's the best place to farm for the Nightblade, I did my google search and didn't come up with much recently I've just been running the Shadow Labyrinth, Mana-Tombs and Botanca according to Wowhead the dagger is supposed to drop from some of the npcs there but I've yet to see it, I've run these dungeons atleast 20 each and I just really wanna know if Wowhead is lying to me, or is there another NPC somewhere that has a higher chance of dropping the dagger?

I play on Neltharion* (cata)

Thankss a lot, gracias gracias &==D

Nvm, I didnt see you talk about CATA