Oil of Immolation question

[Reason]

I keep seeing that these should be brought on the Priest's Epic Quest for the Benediction Staff. Why? I'm at a loss here. Does 50 fire damage to any enemies within a 5 yard radius around the caster every 3 seconds for 15 seconds. Maybe it is just me but that doesn't seem like a lot.

 

[Neirai the Forgiven]

I don't know why... but perhaps the priest is swarmed by many small weak creatures... the oil of immolation works great if you dont have thorns or retribution aura

 

[[7F]LarryBoy]

That's exactly it. The mobs that attack you during the quest are incredibly weak, but there's lots of them.

The Oil has no cooldown, so you can just spam it.