Karthus

Phantom ⬥ Sorcerer ⬥ Champion

Updated for patch 9.19

Items

Recommended

Seraph's Embrace
Morellonomicon
Rabadon's Deathcap
Data is based on Scarra's video. Suggestions? Comment below or on this google sheet.

Requiem

Active ability

Channels for 2.25 seconds to deal 350 / 600 / 850 magic damage to 5 / 7 / 9 random enemies.

Sorcerer

class synergies

Innate: Sorcerers' basic attacks grant twice as much mana. Synergy: All allies gain ability power.

Phantom

origin synergies

While at least2 Phantoms are in play, at the start of combat, a random enemy's health is set to 100. Works against epic monsters, but deals less damage.