some do see invis and have a large agro range and they summon but they can be mezzed. done this task with a monk training the surrounding mobs away, mezzing the shards that spawned and zoned into FC when i had all 10. they will despawn after several minutes
They don't see through invisibility. The 2 I could check didn't anyway. May help people you are with, but it will not help you if you are the one that spawned the little fella =P