Karthus, the Deathsinger is a ranged magechampion whose abilities specialize in dealing heavy sustained damage in an area of effect fashion. Capable of dealing damage from both near and afar, Karthus excels at both inflicting constant harm to the enemy team from a distance as well as decimating the enemy team's collective health pool through the application of a high-risk, high-reward, self-destructive playstyle.
Lay Waste grants a small instance of sight before detonation.
Lay Waste hitting a single target lists damage as a critical strike both in the damage text in game and in the post-game screen, where the damage from Karthus's most powerful Lay Waste will appear in the post-game's "Largest Critical Strike" section of the graphs.
**Despite this, Lay Waste can not actually critically strike and, as such, does not scale with Critical Strike Damage even if it hits a single target.
Wall of Pain
COST: 100 mana
Active:Karthus creates a wall at the target location for 5 seconds that provides sight around it for the duration, slowing enemies who pass through it by an amount that decays over 5 seconds and reducing their magic resistance by 15% for the duration.