I quite liked the old 1e morale system for monsters.  It works quite well for pack/mob type creatures like kobolds.  Here is a quick rule you can use to simulate that old rule in 5e.

Once at least one of a groups of monsters number is defeated, the adventurers can compel them to submit with a successful Charisma (Intimidation) check. The DC of the check is 10 + (5 times the number of remaining monsters): for example, if one remains, the DC is 15; if there are two left, the DC is 20, and so on.

The DC should be set appropriately to the level of courage of the creature.  Goblins and kobolds may have a DC of 0 while veteran NPCs may have a DC of 15.  After a certain point the DM should just roll each round for each creature and not wait for the PCs to make a skill check.


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