If you are going for some unknown katanas, you can take a look at this underrated one. The Serpentbone Blade is given as a reward for Elden Ring Items completing the second letter quest in Volcano Manor from Tanith. it looks very awesome and has inherent poison buildup, this combined with the Double Slash ash of war that it comes equipped with, means that it can dish out considerable amounts of damage and build up poison quicker than almost anything else in the game. This deals with lethal poison, which only lasts about a third of the amount of time as regular poison, but deals double damage per tick, meaning if both are left for their full duration, the lethal poison will do less damage but it does it at a higher more concentrated rate. If you keep refreshing the lethal poison of this blade, it will deal a huge amount of damage, if you combine this with talismans such as the Rotten Winged Sword Insignia and Kindred of Rot's Exultation, you can make the poison proc almost instantly. It can get a bit of elden ring items buy online utility when used with a bleed weapon.