Domination Rune/Keystone Concept: Deathfire Blast
Deathfire Blast: Your Ignite is replaced with Deathfire Blast. Upon cast your character will begin a channel animation in front of them [you can move during this channel, however hard CC will interrupt it.] channels a small dark sphere) after 2.5 seconds the sphere will release in the direction of your courser {up to 800 units away], hitting at the location of your courser in a small AOE {250 radius]. Dealing % of targets max health over time and increasing subsequent damage by 15% for 3 seconds. Cooldown 210. Scoring a Kill or Assist reduces the remaining cooldown by 10 seconds.
Another Keystone idea that can bring back the effectiveness of Deathfire Grasp on a lesser scale, and in a more balanced way, with counter play it being a channeled skill-shot. Looking for some feedback from a Rioter and the community. :3