Sunfire Aegis

Unique Passive - Immolate: Taking or dealing damage causes you to begin dealing 20 (+1% Bonus HP) magic damage per second to nearby enemies (increased by 25% against minions, monster) for 3 seconds. Taking or dealing damage refreshes the duration of this effect. Damaging champions or epic jungle monsters with this effect adds a stack, increasing subsequent Immolate damage by 10% for 5 seconds, stacking up to 6 times for a total 60% increase

14.19: Damage no longer ramps against champions or epic monsters.