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Can you use Stunning Fist (or similar rider effects for that matter) with Mighty Fist of the Earth? This would be for PFS, so please stick to strict interpretations.
Stunning Fist Full Description
Mighty Fist of the Earth Full Description
I have bolded relevant sections below that might indicate it works. I'm not intimately familiar with monk rules and rulings, though.
If the attack is successful, the rock deals bludgeoning damage to the target as if you had hit the target with your unarmed strike
Stunning Fist forces a foe damaged by your unarmed attack to make a Fortitude saving throw (DC 10 + 1/2 your character level + your Wis modifier), in addition to dealing damage normally.
"If the attack is successful, the rock deals bludgeoning damage to the target as if you had hit the target with your unarmed strike."
That last bit is key. Treat it just like a regular unarmed strike. It can be a ki strike, and there is no reason not to also allow it to be a stunning fist strike too, if the character has that ability. There is no reason it couldn't also be a Scorpion Strike, Gorgon Strike, and so on. This just allows one ranged unarmed strike to be made. What it can possibly do is fully limited by what other feats the character has. Interesting spell/effect, and most opponents would rather be taking only one attack from range than having a Warpriest/Monk smash their face in up close and personal like many more times than once.
I disagree, because you have not hit the target with an unarmed strike, so Stunning Fist cannot activate. You do damage as if you had hit them with an unarmed strike. But, that is different than actually hitting them with an unarmed strike.
If the spell said "This counts as an unarmed strike against the opponent" then Stunning Fist would be allowed. But, doing damage as if it were an unarmed strike is not sufficient.