When I enter deepsands cave and smash the egg sack nearest the entrance with my warrior it allows me to continue smashing until the game nearly crashes from all the hatchlings. I killed about ten smashes worth in one group them walked away to explore, and on walking back there was an innumerable swarm. The egg sack never broke and kept releasing mirmek( i may have kept smashing it a few times lol) they gave zero XP after a certain point so it's not exploitable.