At Sea Encounters

Source: Dungeon Master’s Guide p. 118

At Sea Encounters

d12 + d8Encounter
2Ghost ship
3Friendly and curious bronze dragon
4Whirlpool (25 percent chance that the whirlpool is a portal to the Elemental Plane of Water)
5Merfolk traders
6Passing warship (friendly or hostile)
7-8Pirate ship (hostile)
9-10Passing merchant ship (galley or sailing ship)
11-12Killer whale sighting
13-14Floating debris
15Longship crewed by hostile berserkers
16Hostile griffons or harpies
17Iceberg (easily avoided if seen from a distance)
18Sahuagin boarding party
19NPC in the water (clinging to floating debris)
20Sea monster (such as a dragon turtle or kraken)
^at-sea-encounters