We looked at how Katarina is doing in Competitive Matches and how certain picks enable her - Click Here to Watch.
+20 Attack Damage
+50% Base Health Regen
UNIQUE Passive - Cleave: Basic attacks deal 20% to 60% of total Attack Damage as bonus physical damage to enemies near the target on hit (enemies closest to the target take the most damage).
UNIQUE Active - Crescent: Deals 60% to 100% of total Attack Damage as physical damage to nearby enemy units (enemies closest to the target take the most damage) (10 second cooldown).