Toil and Trouble: Problematic Abilities

AleneShazam wrote:Challenge Fate (6) – Magic Interrupt
Trigger – The DM makes a D20 roll and you dislike the result
Effect – You can tell the DM to treat the result of the d20 roll as a natural 1. No rerolls are possible.

Trying to get this to work with a PbP, even one with a fairly active OOC skype group, is giving me a headache.

So far the best my players and I can come up with is a rewrite along the lines of being able to apply the effect of a natural 1 on an event that the player character is aware of. This makes it so that stealth NPCs aren't entirely shafted due to having to specify that stealth rolls are being made. I'm also inclined to limit it to NPC actions so the PC can't make a blackhole collapse on itself and consume the universe as a super-blackhole or something stupid like that.