Monster/NPC stat blocks are intentionally simpler than PCs, because there's not normally any reason at all to give them that level of detail. It's one of the things I most love about 5E; as a GM, I can plug-and-play a stat block on the fly for just about any encounter.
"Please pay attention very carefully, because this is the truest thing a stranger will ever say to you: In the face of such hopelessness as our eventual, unavoidable death, there is little sense in not at least TRYING to accomplish all your wildest dreams in life." - - Kevin Smith
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Short answer: You don't.
Monster/NPC stat blocks are intentionally simpler than PCs, because there's not normally any reason at all to give them that level of detail. It's one of the things I most love about 5E; as a GM, I can plug-and-play a stat block on the fly for just about any encounter.
Ptolus, City by the Spire - 2016 Campaign of the Year
"Please pay attention very carefully, because this is the truest thing a stranger will ever say to you: In the face of such hopelessness as our eventual, unavoidable death, there is little sense in not at least TRYING to accomplish all your wildest dreams in life." - - Kevin Smith
There's certainly nothing stopping someone from building up a quick DST for it.
- Kallak