So i want to start with saying that i am a destiny 2 fan boy and love all the added d2 models 
So last night i did grims with a few people and the rats were talked about and it hit me, The Rat King pistol from d2. It could be a rare (Like actually rare, like 1 in 3m but the whole party would drop it. There are alot of rats killed per run.) drop from the rats. And concept for how it would be special, if you are a T it would grant invis on kill for 6-10sec depending on roll (Which would be cancelled if wounded or if a shot is fired) and on inno/det rounds it would buff damage if in close proximity to 2 other inno/det. With the dmg buff it would 4 tap body and 2 tap head otherwise it is 4tap head and 7tap body. Could also have potentailly the ornament variations from within d2 as variations in ttt aswell 
Might be out there but i think it would be a cool concept if done well
So last night i did grims with a few people and the rats were talked about and it hit me, The Rat King pistol from d2. It could be a rare (Like actually rare, like 1 in 3m but the whole party would drop it. There are alot of rats killed per run.) drop from the rats. And concept for how it would be special, if you are a T it would grant invis on kill for 6-10sec depending on roll (Which would be cancelled if wounded or if a shot is fired) and on inno/det rounds it would buff damage if in close proximity to 2 other inno/det. With the dmg buff it would 4 tap body and 2 tap head otherwise it is 4tap head and 7tap body. Could also have potentailly the ornament variations from within d2 as variations in ttt aswell Might be out there but i think it would be a cool concept if done well