This is an uphill battle where survival and scaling are your only priorities. Cassiopeia is a premier lane bully who can punish every stack with into spam. You must play purely for experience and stacks under your tower while relying on to stay in lane.
This is a nightmare lane for Nasus. Cassiopeia is a lane bully who thrives against low-mobility juggernauts, using her range and grounding to prevent you from ever touching her. You are playing for survival and stacks, not for lane dominance.
This is a scaling lane where you play for the mid-to-late game. Diana has high early burst and waveclear, but you have superior sustain with and can eventually out-duel her once you have some Magic Resistance and stacks. In the short mid lane, your goal is to stay healthy and keep the wave near your turret.