As we all know purifer has a ton of ability's that are complete junk and will never be used ever, while wall of fire is kinda cool in that fact it has no target limt and you can just place it and leave it, I feel that this skill should be something that is important to a purifer since purifer heals wtih fire, a simple change would make this ability so much more fun and useful.
My first choice, which will probably never happen would be to turn this into ground effect that would proc small sheilds to people who stand in it, doesnt have to be a crazy amount of sheild but something to make it worth the cast.
My 2nd choice which is Probably the better option and less op iIsuppose would be to change it into something like the old archon ground ae. Increase the amount of heals or even just sheilds for people who stand in it.
If changes to this ability are made it will need a longer duration maybe 15-20 seconds, with a recast of 1 to 1 1/2 mins depending on how powerful it is made.
Oh on a side note does anyone else think soul brand the 5% increase dmg taken is kinda lame