Hadn't been to this zone in 12 lvs, 17 monk, and i saw this this. I had swam from the place where the tads are to get here to see how bad i could kill a skellie. Well, I from I distance i thought this thing was a large misquato. I got up close. Nope, it was sperm with teeth, first time I EVER saw one. Conned blue to me. i hailed it to see if it was an aggro mob, since misquatos and scorpoins, and buckteeths con they are but they don't. no aggro. I beat up on it and it was hitting 6- 8 on average with the occasional 12 damage. Near the end it hit me for 26. Are all these things non-aggro and very weak. Oh and btw they run when low on health.
These monsters (giant sperm if you prefer) are much higher than 13th level.... This specific Insatiable was the thing that killed my Necro in the Swamp when she was 12th level. And in a few hits,as well.