ZestBlog

In the description for the "Tadpole Chambers" on VGM 78, it stats "The elder brain dictates that populations of tadpoles be kept in smaller pools under guard, away from the brine pool. Should the brine pool be destroyed in an attack, these tadpoles stand a better chance of survival."

On the map on page 79 there are two tadpole chambers off to the side of the "Resting Pool." Also, the Elder Brain Chamber is above the Resting Pool and seems to show an Elder Brain in an enclosure similar to that depicted on page 73 but which is set into the ground or a low dias. I'm assuming that the enclosure is filled with brine.

There seems to be an opening that implies that perhaps the elder brain can levitate down from its enclosure into the resting pool below. That could be one weakness. If the party can manage to attack from below. The EB will still have the Wall of Force lair action, but it allows for an opening of the party getting in some big hits.

Also, given the damage an EB can give out, along with its mind flayer, grimlock and quaggoth minions, I don't think that the enclosure has to be that tough. Yes, it block ALL damage to the EB until it is destroyed, BUT it needn't have very high HP. Perhaps 25% of the EB's HP, so 30-75, or 53 if you go with the default of 210 HP for the EB.

I will likely also rule that barrier can only take damage from bludgeoning and piercing damage. None from slashing, fire, acid, etc.

Once the enclosure is destroyed the EB would levitate down into the resting pool, casting a wall of force on the portal separating the EB Chambers from the Resting pool. This would be not only to get away from the players, but also because it needs to be in the brine solution to survive. They could get one opportunity attack and then would need to find their way down to the resting pool.

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