The Scythe's 1h R2 is a somewhat quick, horizontal/diagonal attack with range. It's probably the quickest move it has when attacking once and moving (fast rolling afterwards is great for keeping distance). The 2h R2 leaves you more exposed with 2 spinning horizontal strikes, and recovering from this takes twice as long as the 1h R2.
As already mentioned, Silver Knight Sword has a wicked horizontal swip. It also is holy, thus a great weapon for Catacombs. I leveled that spear to the max (as well as having good Dex stats) and never died once in Catacombs, the ONLY level thus far where I never died. I was literally 1 shotting 3 skeletons at a time with the R2/RT.
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