That question will be relevant if I have the feat in my test run. Will I rip out chunks from the ground for each attack I get, or just once?
For each attack.
That could probably use clarification then somehow. Though before suggesting wording I'd like to get an idea of whether that clearly applies to other throwing attack roll maneuvers as well. I know it would apply to Ama-no-Iwato Throwing Event clearly. These are the following maneuvers that have thrown attack rolls:
-Gather Sign "Throwing Mt.Togakushi" (Form massive rock for each attack in full attack?)
-Oni Sign "Complete Massacre on Mt. Ooe" (Throw number of adjacent enemies equal to attacks in full attack, so long as you have other creatures to throw them at?)
Marvelous Mt. Ooe (counts as parent school for the purposes of feats right?)
-Oni Sign "Anomalies, Strength, Disorder, and Spirits" (This one is weird since it's already capable of targeting multiples, so is it full attack against each new target? If so does it make them save more than once?)
-Mysterious Ring"Hell's Wheel of Pain" (full attack worth of rings against each target?)
Weird combinations here, but by the current wording they all qualify. Now just have to figure out what the hell a thrown full attack looks like for all of them.
-Hoo boy that saves section under mob seems unclear. Language that broad and sweeping will probably just require serious GM adjudication to be clear on what and how things effect you.
You're free to suggest better wording. 
Ok first, I assume what it meant by negative levels was referring to how losing creatures will lose you HD and all the effects that brings?
No, it's just regular negative levels, penalty to rolls and stuff, no recalculating HD.
Second, define "disable" because the two examples you listed are almost completely different. The fact that a curse can do three different things doesn't help.
Disabled as in “not able” as in “still alive but cannot take actions at all”. Stunned, dazed, that sort of things. A blinded/cursed creature may still be able to act.
I'm still not quite grasping what it means, though the disabled definition clears things up considerably. What exactly is worse than negative levels as it loses members that is not affecting it? Here's a rewrite attempt so we can maybe see whether/where I'm getting it wrong:
"Saves: A mob uses the same saving throws as the base creature. However, only effects that inflict negative levels or prevent a creature from taking any actions whatsoever will have any effect on a mob."
Ah, there seems to have been some confusion. The idea is that each effect that would disable a mob member instead inflicts a negative level in the mob.
So blindness doesn't affect the mob, but something like Hold Monster would result in a negative level.
There we go. So here's my suggestion then:
"Saves: A mob uses the same saving throws as the base creature, but only effects that prevent a creature from taking any actions whatsoever will have any effect on a mob. Rather than preventing actions however, such effects will inflict a negative level on the mob for their duration instead to represent the temporary loss of a member."
This of course raises the question of whether you can stack such effects to negative level a mob until it no longer has enough members or runs out of HD, and what then happens to the mob as a creature?
