Lost ritual knife, where can I find a new one? (Divinity: Original Sin 2)

THExbo0m
This fiasco bro, this fiasco!

Speaking of which, I from the tables fell ritual knife fell out why 3 of the root and the Cup... I was like um.... surprised - loaded the last save I I I I, lo it fell out... what I am saying, - Yes, the fact that the game is all the Bugs!

I'm on Nameless island, and I have in inventory two ritual basin, and two obsidian Lancet, all from the house of Siwa.
Strange, where they have lost, they're not heavy, why to throw them away.

rude awakening quest, where to find obsidian Lancet ? or how to wash old, write that dirty in the dust and shit what?