Malfunctioning Tidal Controls

Level 3Hazard (Complex)
HazardRareMediumLegacy
AC
22
HP
42
Speed
0 ft.
Perception
+0
Fort
+14
Ref
+6
Will
+0
Stealth
+13
Recall Knowledge DC 23 (arcana)
Disable DC 20 nature (trained) to neutralize the tidal magic, or DC 23 survival to predict the changing tides, or DC 23 thievery (trained) to scratch away the sigils; two total successes are required to disable the trap.

Sigils carved into the turquoise sphere atop the altar illuminate. Moments later, a rush of water flows into the hallway.