A place to share thoughts and ideas about Dungeons and Dragons
[Check out this newer post on this subject: D&D 5E – Quick Reference – Chase Rules.]
A couple of years ago I published chase rules for D&D v3.5. You can download them here.
With the release of the fifth edition of Dungeons and Dragons, those rules seem rather heavy. You can still use them if your campaign will have a lot of chases. However, in keeping with the slimmed down rules of 5e, I am proposing a simple house rule for chases. The description below is in terms of a PC character chasing a fleeing foe. Keep in mind that the same rules apply when the PC is the one fleeing.
Most of the time the standard rules for combat work just fine. A chase may occur when one or more opponent turns and runs away. In game terms, he uses the Dash action to spend his entire turn moving away from combat as quickly as possible. If he starts his turn within 5 feet of you, or passes within 5 feet of you, you can use your Reaction to make an opportunity attack.
It all depends on how far away you are from him at the beginning of your turn. Compare this distance to your characters speed. There are three possible results.
A chase is not a race. There are multiple factors that could enable a creature to catch up to another one that has the same speed. Even a lucky slower creature should have a chance. Here is my house rule:
At the end of a turn where you have used a Dash action to advance toward an opponent that is fleeing, you may call for a Strength (Athletics) contest between the two characters. If you win the contest, you move an additional 5 feet toward your opponent. If you lose the contest, you move back 5 feet.
Characters can’t continue running at top speed forever. For extended chases:
After 5 rounds of continuous running, a character must make a [DC 15] Constitution save or suffer one level of exhaustion. Each additional round of continuous running requires another save at an additional +2 to the DC.
The DM may rule that certain creatures are immune to this exhaustion effect, or that they can run for longer periods before requiring this check.