In my experience, there are two scenarios where people will Ready in combat:
I'd also like to find a way to allow Readying outside of combat - ideally, it could be merged with the surprise rules, so that Readying is the usual way to set up an ambush. (You can't take reactions when surprised, so Readying still would not protect you from being ambushed.) Players are always trying to Ready ambushes anyhow, it's the natural and intuitive thing to do, so why not make it the correct thing to do and save some hassle?
- A melee warrior can't (or doesn't want to) close with an enemy on his/her turn, but anticipates that the enemy will close on its turn, and wants to prepare a warm welcome. A flying melee monster, or an enemy between 35 and 60 feet away, would be a good example.
- An enemy is using hit-and-run tactics; for example, an incorporeal monster phasing in and out of walls, or a rogue playing games with Cunning Action and Hide. PCs who are unable to rely on opportunity attacks might Ready a ranged attack, a cantrip, or (in rare cases) a leveled spell.
I'd also like to find a way to allow Readying outside of combat - ideally, it could be merged with the surprise rules, so that Readying is the usual way to set up an ambush. (You can't take reactions when surprised, so Readying still would not protect you from being ambushed.) Players are always trying to Ready ambushes anyhow, it's the natural and intuitive thing to do, so why not make it the correct thing to do and save some hassle?
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