Originally Posted by MasterTransmuter
Passive - whenever an opponent drops below 5% health, a bolt of energy strikes all enemy champions. 3 minute cool down.
R: If karthus dies in the next 10 seconds, he enters a spirit form allowing him to continue casting spells for 7 seconds.
You did Karthus first and ruined everyones fun.
Passive: Every 10 seconds when he right clicks fires a projectile to target area, revealing it and doing damage.
R: After 3 seconds AoE true damage explosion around Kog.