Leveling Up Darius W?
Riot is so bad at champion design and balance that they literally, and probably in inadvertently, made it completely useless to level up Darius's W. Nothing on this stacks anymore. Damage does not increase per level. The slow does not increase per level. Mana does not increase per level. The only thing that changes is you get 1 second off your cooldown per level. Why bother?