The volcanic rune is amazing, I've used it with my 5 star breton templar probably for about 2 years and have it on my breton sorcerer also. It's great against hiding chicken nightblades and a great bonus is that many players seem to get very salted up after stepping on it, this is based on some of the mails I've received from some butthurt players. It's not so useful in the large open areas, but it often comes as a surprise for enemies when most players are used to fighting the typical copy paste builds from the interwebz. Funny useful tip how to use the rune against the frustrated enemy, who has realized he won't be killing me and starts bagging in front of me as a quitting "I don't want to fight you anymore, because you're too strong for me." gesture. When the bagling is pushing his stick in front of you like a premium dumbarse, just dip the rune under his nuts and wait for his next bag aiming fast up, when he lands and is down on his back, then you have a moment to bag, sweep the face or whatever emote the bagling when he's on the ground. At this point they aren't ususally any threats or willing to fight at all so then there's still the chance for getting some entertaining salt mail from the bagling.