Sand Aerosol

Overview
Sand Aerosol is a legendary level 50 longsword, dropped from Sa'jun the Centurian Chieftain, the boss of Desolate Dunes. It has an 11% critical chance and does 419 damage. It is currently the strongest weapon in the game, despite its difficulty of upgrading. It is the only Legendary sword in the game currently, making it incredibly hard to upgrade.

Sand Aerosol upgraded to max (+20) has a damage of 838.

The drop chance for this item is confirmed to be 0.02%.

While this weapon has the most potential damage, it is quite unlikely it'll be achieved considering its high upgrade cost.