A place to share thoughts and ideas about Dungeons and Dragons
I haven’t posted here in a while. I have been working on 5E Ship-to-Ship combat rules. They will be finished soon. In the mean time here is part that may be of general interest.
Rough water adds 5 to all the following DCs except for saves made when more than 5 feet under the surface. Flotsam or other floating items grant advantage to saves to stay afloat.
This can be hazardous to your health. If you fall overboard you will splash down 1d6+5 feet from your ship. If you are pushed overboard you will fall 2d6+5 feet from your ship. If you jump or dive into the water you can enter the water at any point up to the maximum distance you can jump (refer to the Jumping rules in the Player’s Handbook). If you fall or are pushed overboard, you must succeed on a DC 10 Dexterity (Acrobatics) check to enter the water without damage. Otherwise you receive 1d6 hit points damage from the fall.
Each foot you swim cost you one extra foot of speed. If you are within 5 feet of a moving ship (or one that has been involved in a ramming or grappling maneuver), you must make as DC 10 Strength (Athletics) check. Failure means that you cannot move this round, you are using all of your strength to simply keep your head above the waves. Once you reach the ship, you must make as DC 15 Strength (Athletics) check to climb back onto the ship. Failure results in you falling back into the water.
You can swim underwater as long as you can hold your breath (see “Drowning” below). Your underwater swimming speed is the same as your surface swimming speed. You can swim straight down at half that speed. You can swim straight down at 15 feet per round if holding the equivalent of medium armor, or 25 feet per round if holding the equivalent of heavy armor. If unencumbered, you can swim straight up at 20 feet per round.
In general, heavy armor is not terribly common on ships. The weight tends to be the most prohibitive factor – falling overboard in 65-pound full plate normally results in death. Occasionally, combat Infantry will don light or medium armor for a battle, but most of the time sailors go unarmored. A lucky few (usually the PCs and important NPCs) have magic items that improve their AC, but most sailors rely on their natural Dexterity.
Attempting to swim while wearing light armor requires that you make a DC 10 Strength (Athletics) saving throw each round. Failure means you have a speed of 0 as you go under water for that round and loose one carried item, shield or weapon (your choice as to what you drop).
If you choose to remove your armor after entering the water, it will take one minute (10 rounds). A successful DC 15 Dexterity (Acrobatics) save will cut that time in half. During this time you cannot swim or take any other actions. You make a DC 10 Dexterity (Acrobatics) saving throw each round. Each round that you succeed you keep your head above water and counts as one round of the rounds required to remove your armor. Failure means that you went under water this round and made no headway in removing your armor. After 3 failures you receive one level of exhaustion.
You can attempt to swim while wearing medium armor, but you must make DC 15 Strength (Athletics) saving throw each round. On a success, if you are on the surface at the beginning of the round, you stay on the surface. Each foot you swim cost you two extra feet of speed and you can take no other actions besides shouting and stowing a weapon. Failed save means you sink 10 feet and lose any still-carried shields or weapons. On the round following a failed save you are under water. After that, on a successful save you can swim toward the surface at a rate of 15 feet per round. On failure you sink another 10 feet.
You can attempt to remove your armor, but you will be sinking at a rate of 10 feet per round during this time. It normally takes 1 minute (10 rounds) to doff your armor, but a successful DC 15 Dexterity (Acrobatics) save will cut that time in half. Without your armor you can swim toward the surface at a rate of 20 feet per round.
You cannot swim while wearing heavy armor, giving you an effective speed of 0. Whenever you are in water, you lose any carried shields and weapons and begin to sink. You make a DC 25 Strength (Athletics) saving throw each round. Success keeps your head above water, or if you start the round under water you can swim 15 feet toward the surface. You can take no other actions. Failed save means you sink another 20 feet.
You can attempt to remove your armor, but you will be sinking at a rate of 20 feet per round during this time. It normally takes 5 minutes (50 rounds) to doff your armor, but a successful DC 15 Dexterity (Acrobatics) save will cut that time in half. Without your armor you can swim toward the surface at a rate of 20 feet per round.
After 1+(con bonus) minutes of holding your breath underwater you fall unconscious, your hit points fall to 0, and you begin making your death saving throws as per the standard rules. However, if you become stable there is a problem. If you are still under water you can’t remain stable. So you must start making death saving throws again. This continues until you die unless you are saved in some way.