Myriad auto-passes the will save (+22 modifier means a minimum roll of 23).

Are Myriad and Delja successfully flanking either aberration from their positions flanking the door (with or without a 5' step)?

And it has been a while since I used a character with sneak attack - If they're flanked, does each attack get extra sneak attack damage, or only the first attack (I know it is only the first attack when it's feinted or otherwise flat-footed, as the first attack makes it so they're not flat-footed anymore for the iterative attacks.)