D&D 5E INJURIES rules questions !

[maritimo80]

In injuries rule the DMG decide in which of the circumstances below the player is given a injury, right?


It has to be in a circumstances only, or may be in all?


The monsters get injuries?

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INJURIES
Damage normally leaves no lingering effects. This
option introduces the potential for long-term injuries.
It's up to you to decide when to check for a lingering
injury. A creature might sustain a lingering injury under
the following circumstances:
When it takes a critical hit
When it drops to 0 hit points but isn't killed outright
When it fails a death saving throw by 5 or more

 

[Ravenheart87]

It's an optional rule. Use it as you wish, it's up to you. I wouldn't bother with monsters, unless you have long term plans with one of them.