Ok to get this straight i didnt get totally owned by them when i was lvl 99 but when i was around the level you face them 15-20 (I think) they were hard as nails probably the most OP common enemy for their level (in DQ9). They know both the shout move that sends party members into shock and call backup, not to mention they can attack TWICE IN ONE TURN! So yeah they are practically invincible. If you face three this can easily turn into 5 and most of you team mates stunned. This will quickly end up to be 10 and all your team mates in shock rendering you unable to attack or defend and you will then die =/.