Okay, this is confusing to me, but now I know the truth!
Crystals do live, so we can say those Ogri'la ogres are not loving items, they love creatures! I was in invisiblity making a mob evade so I can start the Simon Says game, but I saw this!
Gameobjects shouldn't have invisiblity detection.
Next time you sell the apexis shards/crystals to a vendor for a potion, rethink about it, they have feelings!