User blog comment:Emptylord/Custom Champion - Milo the Sunfire Alchemist/@comment-3974211-20121012231538/@comment-3286233-20121015032353

I did have a scrap champion that leaves a trail behind similar as Singed Poison Trail, but it's hard to see and it only slows enemies instead (as well as boost allies movement speed). However it has two purposes:

He also creates an AoE which makes him move faster inside and makes the trail turn into small but impassable terrrain while inside the AoE which last for a duration.

The other is an small AoE spell which ignites the trail into fire which deals deals initial damage and damages over the time. The trail however will be consumed instantly and will be put on cooldown if the trail is toggle on. Walls that are active will turn into similar as Rumble's The Equalizer, burning enemies who stands on the area.