Cliff Serpent

A menacing serpent relentlessly patrolling their territory, its wretched form cladded by stone. Its most prominent feature however, is its glaring eye. Many have made the mistake of entering the territory of the serpent. Few have ever left, and those who have, had its burning eye, forever etched into their memory.

The lair of the serpent itself is quite small for its size, only being a medium sized, flooded, wall-side cave with scarce amounts of land. There isn't much to this lair, except for the occasional horde of treasure from fallen ships.

Lair Actions

On initiative count 20 (losing initiative ties), the serpent takes a lair action to cause one of the following effects; the serpent can’t use the same effect two rounds in a row:

• The serpent causes a tremor in the arena which makes rocks that are 10 ft in diameter passively fall from the ceiling for 4 turns. All creatures in the trajectory of these rocks must do a DC 17 Dexterity saving throw, dealing 36 (2d6+34) bludgeon damage on a failed throw and half as much on a successful one.
• The serpent gains a temporary boost of speed for 4 turns, speeding up to 60 ft.

Regional Effects

The region containing a legendary serpent’s lair is guarded by the serpent, which creates one or more of the following effects:

• If anyone heads into the serpent's region (which is it's territory), the serpent has a good chance to detect and chase them down.
• Items that go overboard have a good chance of being lost to the serpent, and hoarded in its lair.

If the serpent dies, these effects will vanish instantly.