Arelith

We know that some properties on weapons inhabit the same "property slot" as other properties and prohibit each other from being used together, such as Spellsword Imbues taking the same slot as Temporary Essences, GMW sharing the same slot as Keen Edge and Darkfire, etc.

Do Assassin poisons share these same "slots" as any weapon enhancing spells? Specifically, my curiosity is how do they interact with Bless Weapon and Blade Thirst? This isn't an RP question of "what Paladin would use poisons!" so hopefully it can stay on topic.

From my use with blackguard poisons, poisons are their own slot that do not compromise other affects on the weapon.

I've had no issues comboing poisons with anything else in the game, save for interaction issues with 2 effects that attempt to place "Unique Power Onhit" onto an item. Bless weapon worked fine.

As far as I know you can't poison a blade thirsted weapon (you can poison it then, blade thirst and have 10 mins of poison). I haven't tried in a bit but I can test it again unless someone else can confirm (just need to find poison and edged weapon)

Yeah, that would be the aforementioned problem interaction between 2 effects placing Unique Power Onhit - one from poison, one from Blade Thirst.