Slash is one of the actions executed with Nevan in Devil May Cry 3. When executing this move, Dante will "attack enemies with the bladed section of the ultra-rockin' guitar."
When executing this move, Dante grabs the guitar by its handle and flicks it back, thus revealing the scythe-like part of Nevan and soon flicks it in a slow, yet brutal slash. This will deal enough damage to enemies and cause them to be pierced and knocked onto the ground. Additionally, a small quantity of bats and electricity will cover over the scythe-like part of the guitar, thus it's what drives the boost of the enhanced damage.