New creature in Summer Update 2008, since Winter Update 2008 it is profitable to hunt this creature. Since Updates/8.5Energy Elementals loot is much better. Even if they have low hp don't underestimate them, they can be as deadly as a wyrm due to their frequently used energy attacks.
A mage around level 100 can easily hunt them and profit solely using soft boots and the dropped Mana Potions.
For spawns where you do not have space to run them, you may want to use manashield if you have less than 500hp as they can combo around 400 relatively easily.
Paladins should attack their with ammunition and Exori San before they deal major damage.
Knights Should try to avoid them at low levels since they are very strong against physical damage. However, at higher levels (around level 90) it can be profitable to hunt them because of the high gold drop rate as well as the many chances of looting NPC sellable items. Mana potions and exura will often be enough, soft boots are also recommended however try to keep some health potions at hand for safety. Knights can take a strong two-handed weapon and use exori when fighting more than one.