I think the rarest Legendary weapon inside of Destiny across all the expansions and years is the Sniper Rifle Supremacy! You don't see many of these and even rarer than the presence of Supremacy is a god roll Supremacy! I think any gun out of the exclusive Queen's Wrath event that happened in year one might be considered the rarest legendary weapon because it was a timed event that never returned. Outside of the Queen's Wrath event that happened in year one and the weapons exclusive to that event, what do you guys think is the rarest Destiny weapon across all three years? Here's some highlights and gameplay of me using the Supremacy in Y3! Really fun gun to use, feels like it has no AA! https://youtu.be/BIVp55M3IsA