Basically, it seems a bit silly that your Barbarian can force the save vs stun, then through his greater magic weapon force the save vs death, and maybe from a feat (like the linked one) force a save vs nausea or whatever -- all with the exact same attack. That leads pretty quickly to a "you're going to fail one of these" scenario.In all seriousness though, I think some language on all the various once-per-round save-or-suck options could be worthwhile. There is such a proliferation at this point, and we really don't want people to be doing more than one at a time.
So, borrowing some language from a popular video game. I propose simply adding the phrase "This is a unique attack modifier" to these effects. The rule would work as follows:
* There can be only one! You can only use a single unique attack modifier per attack.
* A target only needs to save once per round at most against any individual unique attack modifier.
* If a target has successfully saved against one unique attack modifier, you are welcome to use a second on your next attack (if you have one). A save against the first does not confer immunity to the second.
I think this would do well with toning down some crazy 3+ saves-per-attack (if not necessarily 3 per round) shenanigans that can slow a combat round to a crawl, while not completely boning people who have multiple of these from various sources. Thoughts on the issue?
If people like it a lot, I'll go ahead and edit it into the various articles on the wiki. If not, just forget I ever said anything.