We are currently halfway through Lightless Depths and at the end of the last session my players...
... had absolutely no intention of destroying Tlalocs Tear (being as wary of the "demon fish that enslave whole tribes" as they are of the "Lords of Dread"). Instead, they plan to trigger the Shadow Pearl they still have (from Vanthus) in the middle of Golismorga.
Did anyone else encounter this plan before? I'm not seeing any kind of fatal flaw.
Now, for the data I gathered so far:
Golismorga measures about 0.4 x 0.6 miles, so the 1 mile burst radius of the shadow pearl should affect the whole city and a bit of the surrounding caves.
It is a Will Save DC 15 to avoid becoming a Savage Creature, so statistically will be affected:
25% of all standard Kopru (meaning 9.5/38 in the ziggurat)
20% of all behemoths (3/16 in the ziggurat)
30% of all dark nagas (3/10 in the ziggurat)
70% of all troglodytes (49/70 in the ziggurat)
That should definately wreak some havoc. I'll assume, that the kopru will concentrate on clearing the ziggurat of any savage creatures, so the PCs will (if they wait a while for the smoke to clear) encounter some savage kopru and troglodytes in the ruined city, but the ziggurat should be mostly filled with unaffected ones - at a much reduced number.
If anyone has ideas or thoughts, I'd be happy to hear them.