Is it supposed to be like this? It does no damage, doesn’t apply a DoT or anything of the sort, its stagger isn’t great, and despite supposedly having a 40% proc rate it seems to have something more along the lines of 8%. As it stands, it’s basically a wasted talent slot, ESPECIALLY when something like Frenzied Flames exist. Why would you ever run it?
It seems to proc quite a bit for me, but I usually only use it with both flame sword and coruscation staff. The thing is, I think enemies have to die of burning damage for you to get a 40% chance to have them make a small explosion. If you have teammates that clear hordes fast (e.g. Merc with Greatsword), you won’t get much utility out of it since they won’t be dying of burning damage much.