Reverse Shift Line or RSL for short is an important glitch used in multiple skips for the Alucard categories. It can be used to skip over rooms or go out of bounds. Its primary usage is for the [[Castlevania:_Symphony_of_the_Night:Glitches#SOTN/Death_Skip|Death Skip]] and the [[Castlevania:_Symphony_of_the_Night:Glitches#SOTN/Relic_Skip|Relic Skip]].