I like Rage of halone. Its average damage is already slightly better than Howling Vortex (like 5% more dmg), that is by current best shot. But the casting time is a bit tricky...the best is to use when you see a monster reading heavy damage skills so it will get boosted if the damage comes during casting. I often use it against frogs, gobling and imps.

Also i find Halone very funny if the monster die before it going out...its like you "fart" all the stored energy lol! Only thing i don't like at Halone is that the animation doesn't match the skill...a dark smoke? Come on! Halone is Ice element! I HAD to be comething light blue! And if possible with ice animation! Would be much cooler an iceberg popping from ground and stabbing the monster from below! That's what i would call "Rage of Halone" =P