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I am not a new DM! I started with the starter set by Gary Gygax in the mid '70s.

D&D 5e says you can make an opportunity attack when a creature leaves/moves out of your zone of control. So if this happens 5 times in a turn you can make opportunity attacks against 5 creatures. Wouldn't a PC suffer levels of exhaustion from doing so?

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  • \$\begingroup\$ Comments about whether the question is a duplicate or not have been moved to chat. \$\endgroup\$ – Rubiksmoose Jul 19 at 17:14
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    \$\begingroup\$ Is there a rule or statement somewhere that you're looking at that appears to imply a connection between exhaustion and making lots of attacks? \$\endgroup\$ – Darth Pseudonym Jul 19 at 19:23
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Usually a creature has only a single opportunity attack available

To make an opportunity attack a creature needs to use their reaction to do so. From the rules on opportunity attacks (emphasis mine):

You can make an opportunity attack when a hostile creature that you can see moves out of your reach. To make the opportunity attack, you use your reaction to make one melee attack against the provoking creature.

And you only get your reaction back at the start of your turn. The rules on reactions state:

When you take a reaction, you can't take another one until the start of your next turn.

Therefore, you usually only have up to 1 opportunity attack available (you actually have 1 reaction available, which you can use on an opportunity attack).

Having multiple Opportunity Attacks available does not necessarily interact with the Exhaustion mechanics

There are some abilities that allow one to have more than one opportunity attack available, such as can be found in this related Q/A1. However, even in the case of a creature with one such ability that is able to make some more opportunity attacks in a single turn, this does not mean a creature will get exhausted unless the ability specifically states so.

This is because Exhaustion is a completely different mechanic that usually does not interact with opportunity attacks at all:

Some special abilities and environmental hazards, such as starvation and the long-term effects of freezing or scorching temperatures, can lead to a special condition called exhaustion.

In general, any ability or circumstance that causes a creature to gain an exhaustion level will have to state so specifically and as far as I'm aware, no ability that grants more opportunity attacks mentions exhaustion.

Differences from D&D 3.5e

You have stated that you started playing long ago so I will add a small note on how this is a deviaton from D&D 3.5e which may be confusing you:

In D&D 3.5e you had an Immediate Action available (which is similar to the 5e reaction) and Opportunity attacks were a separate thing. In 5e, an Opportunity attack uses your reaction instead of being a separate mechanic (as stated above) so there is no need for a rule that further limits the number of opportunity attacks one can make.


1. Found by illustro

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  • \$\begingroup\$ Limiting the Opportunity Attacks in this way creates more tactical options, especially for players. For example, a high AC and/or HP member of a trapped party can rush past a number of enemies and draw out their reactions, which now cannot be used on the more vulnerable characters closely following. I believe 4e shared this limit. \$\endgroup\$ – aherocalledFrog Jul 19 at 17:25
  • \$\begingroup\$ @aherocalledFrog No, 4e permitted 1 OA per other character's turn, plus 1 immediate action not-on-your-turn per character turn. \$\endgroup\$ – Yakk Jul 19 at 18:26
  • \$\begingroup\$ I was playing opportunity attack wrong. I was allowing PC's to attack any creature that moved out of or through his/her zone in a turn rather than just one attack as a reaction per turn. Thanks. I was just getting mixed up with the new rule system as I only used Gary Gygax's Basic Rules and then AD&D rules. Now I am using 5e. \$\endgroup\$ – John Kyff Jul 21 at 3:31

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