I believe the intent of Stunning Strike is that it can affect all creatures, however there exists a basis for saying it does not work on Constructs and Undead (non-living creatures) in the book.
Are dragons immune stun?
Almost no creatures are immune to stun by default and even creatures with +5 con saves get stunned with how many attacks a monk gets. Even if this wasn’t so likely, a stunned main opponent instantly makes every fight boring.
How many times can I use stunning strike?
As I level up I can use it more, and more as a monk. In a single round monk can attempt to stun a maximum of up to 5 times (including a possible attack of opportunity, which is very likely to happen with polearm master). The effects of stun are pretty devastating on monsters, and it’s a really effective boss killer.
What is the DC of stunning strike?
Stunning Strike is, in my opinion, the monk’s signature ability in 5e. It allows you to spend a ki point to potentially stun the target of one of your melee weapon attacks. It’s particularly great because if a creature fails the save and is stunned then they are stunned until the end of your next turn.
Can you flurry of blows and stunning strike?
1 x Bonus Action can be used for Flurry of Blows allowing 2 x Unarmed Strikes. Now you add in Stunning Strikes.
Can you use stunning strike on flurry of blows?
Yes, Stunning Strike can be used with Martial Arts. This was true in the original PHB and is still true when considering errata published in 2015. Although unarmed strikes are no longer listed as melee weapons on the weapons table.
Can you use stunning strike multiple times in a turn?
The problem with this feature (and why even Mercer from Critical Role hates it) is that the Monk can use it after every attack that hits. So long as there are “ki” points available, the Monk can keep attempting “Stunning Strike” more and more as they level.
