League of Legends Reforged Rune: Deathfire Touch

Dealing ability damage or pet damage to enemy champions inflicts a burn that deals 1.5-6.53 (+1.25% of ability power) (+3.5% per bonus attack damage) magic damage every 0.5 seconds over the duration (depending on level). After the burn has lingered on a target for 3 seconds, its damage to them is increased by 75%.

The burn's duration is based on the form of ability damage dealt to the target and is refreshed on subsequent applications:
- Spell damage: 4 seconds.
- Area damage: 2 seconds.
- Persistent damage: 1 second.
- Persistent area damage: 1 second.
- Pet damage: 1 second.