The tentacles writhe in pain at both your attacks, then, in desperation, they fling out at both of you. They are clearly quite wounded and you know if you can keep going they won't have much longer. That is, if you can resist the tentacles hold...They each wrap around both of you, attempting to crush you.
ooc: Ok, no attack of opportunity for the grapple since they have a special ability. You can, however, try to roll an opposed grapple. DC 24 for Raknesh and 21 for Bryon. If you fail your grapple you are being constricted and take 19 damage. All normal rules for attacking while grappling apply. See:
https://www.dandwiki.com/wiki/SRD:Grapple
Meanwhile, some of Tanzy's attacks seem to be doing good and, a moment later, Halek rushes in of all people. Child or not, you're happy to see him. Especially when he releases a bolt of white energy at the thing.
We need to keep attacking the head! he urges. As the words leave his mouth, the creature starts to emit a high pitched screech. You feel like your ears are going to burst. ooc: Roll fort save DC 20 or become temporarily deafened and take 15 sonic damage.