Do most folks read this as affecting saves that same turn? As in that same attack even?
Example: Monk hits and uses Flustering Strike (target fails). Can the Monk also declare a Stunning Strike or Grapple attempt (w/Grappler feat) on that hit?
The trigger is "When you hit a creature with an attack roll". You apply the effect at that point, resolve the effect, and the creature is affected by it from that point out. So yes potentially it could apply to that same attack, and certainly to that same turn.
Example: Monk hits and uses Flustering Strike (target fails). Can the Monk also declare a Stunning Strike or Grapple attempt (w/Grappler feats) on that hit?
Yep, you could even apply all three. Note that specifying the order of these abilities is dependent on the rule that says the player whose turn it is picks the order for simultaneous effects. As such, if it's not your turn, the DM could specify Stunning Strike before Flustering Strike, which would be relevant to opportunity attacks for example:
Declare you're making an Unarmed Strike, choosing Grapple
You hit the target, triggering two effects—Stunning Strike and Flustering Strike
Resolve Flustering Strike first (assume the target fails)
Resolving Stunning Strike—target has disadvantage from Flustering Strike
Resolve the Grapple—target either automatically fails due to the effects of Stunning Strike, or has disadvantage from Flustering Strike
The new Fairy Trixter feat’s Flustering Strike:
Do most folks read this as affecting saves that same turn? As in that same attack even?
Example: Monk hits and uses Flustering Strike (target fails). Can the Monk also declare a Stunning Strike or Grapple attempt (w/Grappler feat) on that hit?
The text doesn’t seem to preclude it.
Sure. There's nothing about it that says otherwise.
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The trigger is "When you hit a creature with an attack roll". You apply the effect at that point, resolve the effect, and the creature is affected by it from that point out. So yes potentially it could apply to that same attack, and certainly to that same turn.
Yep, you could even apply all three. Note that specifying the order of these abilities is dependent on the rule that says the player whose turn it is picks the order for simultaneous effects. As such, if it's not your turn, the DM could specify Stunning Strike before Flustering Strike, which would be relevant to opportunity attacks for example:
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Very cool, thanks all. That is some pretty good synergy right there.