Actually, you can do it to multiple opponents with one Standard action. You just have to roll separately for each. And the mask is only a level 5 item. I'm a level 4 PC. I've also got the Staff of Ruin +1, and magical armor and neck slot. I pull my weight by being the only striker in the group and putting out a lot of damage through multitarget spells.
Then that's the wolverine's fault for failing its check, I guess. If I bomb a check on a red dragon, do you know what I just did? I made it easier for the dragon to kill us all because I didn't peg it with damage or status effects, or do something useful.
More like "it's supposed to be an impossibility, but proposing to make it an "I win faster" button that ends about 25% of fights earlier than planned". Seriously, have you ever tried this skill without maximizing it? It's freaking impossible. The only time my party used it, they had to spend all their standard actions using Aid Another on the guy with the highest check (which I believe according to RAW doesn't even work) and he STILL had to roll a 15 to pass. Luckily for him, he did. It flew in the face of "logic" because the party was losing the fight, but it was hilarious, climactic, and relieving. Everyone loved it.
Well, I'm not going to, because there's nothing wrong with it. I'm not using illegal sources or crazy builds. I just stacked a few feats and items together, like most any character does. Why the hell would fellow players get mad at me for making an encounter easier to win? Nobody gets mad at you for stacking on piles and piles of damage, and effectively doing the same thing via attrition, instead of all at once with a single check.