Project Slayers offers different weapon options for Humans/Demon Slayers and Demons. There is a total of seven Katanas that Humans and Demon Slayers can use, while there is only one set of Demon Claws that Demons can use.
Most Katanas in the game provide the default auto combos. The only exception is Shinobu’s Katana, currently the strongest in the game, which has its own unique LLRLR and RRLRL combo.
Meanwhile, Demon Claws come with both their own unique combos and two unique Claw Moves, one of which has a knock back effect.
The two common Katanas (Golden and Green can be purchased at Kiribating Village), while the other 5 are boss drops from T1/T2 chests from Demon Slayer Bosses (Sabito, Zanegutsu Kuuchie, Shiron, Giyu, and Sanemi), with each Katana having a higher chance to drop from its matching boss.
Demon Claws will will require you to farm 250 Demon Horns and exchange them for Claws at Tony.
All Images and info taken from the official Project Slayers Trello board.
We don’t know the exact drop rates for any Katana other than Shinobu’s. After 30-40 T1 boss kills (Sanemi, Shiron & Kaden mostly), it seems that Rare Katanas (Lighting & Water) have 8-10% base drop rate from T1 Chests. I would assume that Legendary Katanas Tomioka’s and Sanemi’s) have base drop rates around 4-5% or lower.