Ichor no longer exists in poxnora, and I'm curious as to why Purefire still deals an increased amount of damage when Ichor is around, which it's not. This rune could use some remaking while keeping the cleansing and dispel mechanic. Unless they still haven't considered spells yet, then I'd understand why.
Ye I put Purefire in my new FS/UD (Champion base being the FS and spells/relics/equips are for UD) bg, and I noticed the Purefire description since I tend to read things over and over again. But ye, I think this should be taken into consideration, there could be other spells with the same case.
I kinda miss the Ichor ability set, but I consider it an acceptable ability to scrap for the sake of simplicity. That said, there are probably many spells/relics that have "legacy" text that needs to be updated. I'd imagine they'll do a more thorough pass once they've reached a more stable game state than present.
Realistically, the ichor clause of Purefire rarely came into effect, so it can probably just be removed.