Zardnaar
Legend
Three I believe, which was all of the PCs that used weapons.
Viscous weapons are not the "best magic items" though.
If we were going buy the DMG guidelines they should have all been wielding a Vorpal Weapon with a Defender in the offhand and if they were doing that, it would have been only HALF of the 11 Legendary items we should have had according to the DMG.
We had no one that wielded dual weapons. The Champion was wielding a Viscous Maul at games end.
My Fey Warlock 8/Arcane Trickster 10/Paladin1/Bard 1 used a Viscous Rapier and a +1 Heavy Crossbow for Ranged with Agonizing Truestrike. She spent a lot of time casting spells though too.
I can't remember what melee weapon the Valor Bard/Warlock used, but he did not dual wield. It was a viscous weapon. For Ranged he used a Longbow.
Rgr. I was using very rates like staff of power, sword of speed etc. There's sone excellent legendaries level 7-9ish in various WotC adventures tgat are better than vicious. Generally +2 or3 attunement and 2 extra dice of damage.
Vicious RAW could conceivably turn up level 1-4 though.