They are vulnerable to thrust, air, and spirit. They conned yellow and oj to my 49 scout and he was able to solo them without a problem using thrust damage arrows. Air Theurgy using main air nukes, or ICE theurgy pets(which cast air DD spells) own these.
As a note, Moorliches cast spells (Roots, DoTs), and have a very nasty proc while meleeing. Can kill 35th rank characters with a single hit/proc combination.
However, as casters, they've got very low life, and they're about as challenging as lesser telamon if you keep their attention on a warrior and the warrior healed.
Just to give you some nasty things to think about: That 'proc' also works at range :(
So far I got killed twice by a moorlich's proc while the beast was firmly rooted and far away from me.
So, if you can't take the 400-700 points (I'm fairly sure it depends on the 'your level/their level' ratio) of damage they deal, stay FAR away from them. Otherwise they're a piece of cake: Bonus with slash weapons, spirit magic, and they just got 1200-1600 HPs (depends on size)...
Drops adamant coral plate (88af stuff), Mystic Robe of Bedazzlement (49af caster robes), and Restless Robes, some sort of friar only robes.
These can also be as high as level 48 or 49, possibly higher. There were some red ones to a 47, all orange now to 48. Not sure exactly what level that puts them at, but I'm guesstimating that it makes them roughly up to level 51 or 52.