Entering the flooded prison, the squad attracts the attention of a pair of Chuul, bizarre aquatic beings that try to drag victims deeper into the facility. Caught off guard, they suffer some significant injuries before dispatching the bizarre beings.
Some casual investigation uncovers a heavily rotted-through storeroom populated with fire-infused rats, which thankfully retreat instead of attacking. Another chamber contains badly rotted shelving and furniture, plus a surprisingly intact chest... that suddenly lunged at the rogue, when she attempted to unlock it! In a panic, everyone bolts from the room, closing the door, and preparing to unleash a simultaneous alpha strike. When the revealed Mimic emerges, a concentrated volley is enough to reduce it to an amorphous blob, which quickly dissolves in the surf.
Further exploration reveals a room containing guard equipment, along with a lever in one wall, that seems to control some mechanism in the prison. It isn't clear just what it is, but the rogue inadvertently steps on a pressure plate... that does nothing. Later assumptions conclude that a spear trap was in place, but disarmed by the lever.
Descending deeper, the prison cells emerged, the floodwater rising to chest level here. Several of the cells seem to contain the remains of long-dead prisoners... but the Cleric realizes, in a flash of insight, that bones shouldn't persist for hundreds of years, exposed to the elements like this. A test shot confirms the presence of nearly two dozen skeletons, which begin to rise, and shamble towards the team...
SESSION NOTES: The initial Chuul encounter was SURPRISINGLY bloody for the heroes, enough that I chose to nerf the paralysis ability (they had to have a grappled hero before beginning the attack sequence). I also removed the fire rat encounter, beyond a bit of flavor. They caught on to the Mimic really fast, and the (disarmed) spear trap left them VERY timid when approaching the cell blocks. They seem extremely paranoid now, which is just DELICIOUS...