CHASES
Strict application of the movement rules can turn a potentially exciting chase into a dull, predictable affair. Faster creatures always catch up to slower ones, while creatures with the same speed never close the distance between each other. This set of rules can make chase more exciting by introducing random elements.
BEGINNING A CHASE
A chase requires a quarry and at least one pursuer. Any participants not already in initiative order must roll initiative. As in combat, each participant in the chase can take one action and move on its turn. The chase ends when one side drops out or the quarry escapes. When a chase begins, determine the starting distance between the quarry and the pursuers. Track the distance between them, and designate the pursuer closest to the quarry as the lead. The lead pursuer might change from round to round.
RUNNING THE CHASE
Participants in the chase are strongly motivated to use the Dash action every round. Pursuers who stop to cast spells and make attacks run the risk of losing their quarry, and a quarry that does so is likely to be caught.
DASHING
During the chase, a participant can freely use the Dash action a number of times equal to 3 + its Constitution modifier. Each additional Dash action it takes during the chase requires the creature to succeed on a DC 10 Constitution check at the end of its turn or gain one !eve.
of exhaustion. A participant drops out of the chase if its exhaustion reaches level 5, since its speed becomes 0. A creature can remove the levels of exhaustion it gained during the chase by finishing a short or long rest.
SPELLS AND ATTACKS
A chase participant can make attacks and cast spells against other creatures within range. Apply the normal rules for cover, terrain, and so on to the attacks and spells. Chase participants can't normally make opportunity attacks against each other, since they are all assumed to be moving in the same direction at the same time. However, participants can till be in range of opportunity attacks from creatures not participating in the chase. For example, adventurers who chase a thief past a gang of thugs in an alley might provoke opportunity attacks from the thugs.
ENDING A CHASE
A chase ends when one side or the other stops, when the quarry escapes, or when the pursuers are close enough to their quarry to catch it.
If neither side gives up the chase, the quarry makes a Dexterity (Stealth) check at the end of each round, after every participant in the chase has taken its turn. The result is compared to the passive Wisdom (Perception) scores of the pursuers.
If the quarry consists of multiple creatures, they all make the check. If the quarry is never out of the lead pursuer's sight, the check fails automatically. Otherwise, if the result of the quarry's check is greater than the highest passive score, that quarry escapes. If not, the chase continues for another round.
The quarry gains advantage or disadvantage on its check based on prevailing circumstances, as shown in the Escape Factors table. If one or more factors give the quarry both advantage and disadvantage on its check, the quarry has neither, as usual.