D&D Underwater Encounter Tables
Random encounter tables for D&D 5e underwater scenes. Five dice tiers, 2,896 total scenarios — pick a tier below. Every scenario is system-neutral so it works equally well with the 2014 Player's Handbook and the 2024 D&D revision.
Single-roll scenarios. Roll d100 in the underwater and get an instant scene.
Roll the underwater d1 table →100 sets × 4 expansions each. Use when you want a small choice tree at the underwater.
Roll the underwater d4 table →100 sets × 6 expansions. Mid-depth table for the underwater.
Roll the underwater d6 table →100 sets × 8 expansions. Deep table for underwater regulars.
Roll the underwater d8 table →100 sets × 10 expansions. Deepest underwater table — campaign-length material.
Roll the underwater d10 table →How to run a underwater encounter in D&D 5e
When your party enters a underwater, give them one round of looking around (a free passive Perception check), then roll on the table below. For combat encounters, pair the scenario with a stat block from Doungim's D&D monster catalogue — over 3,000 monsters indexed by challenge rating. For role-play encounters, grab a pre-built NPC and read the scenario to your players.
The d1 table is best for quick interludes between major dungeon scenes. The d10 table is for campaigns where the underwater is recurring — sessions in Waterdeep for instance, or a long-running tavern HQ.