I have not seen any items with the killing chamber effect in recent expansions, any chance on the return of items with this unique ability?
It's on an adornment in Visions of Vetrovia. However, much like nearly every other effect added as an adornment from the 'What effects would you like to see return?' post, it was added as an adornment without the effect being scaled up to the current tier even remotely, so it is completely worthless.
I remember when this item was introduced the first time and how fun it was. So when I was able to get it out of a box I was ever so happy..... until I saw the damage it did was still the same as the original one. It would really be worthwhile if they actually adjusted the damage to today's mobs health.