Iron Heart Surge

3.5e has the Tome of Battle: The Book of Nine Swords, a book designed to give fighting characters more awesome abilities divided amongst nine different schools of battle. One of these schools is Iron Heart, focusing on determination and weaponskill to achieve almost supernatural things.

One of those maneuvers is Iron Heart Surge.

Tome of Battle

Iron Heart Surge
[...]
Your fighting spirit, dedication, and training allow you to overcome almost anything to defeat your enemies. When you use this maneuver, select one spell, effect, or other condition currently affecting you and with a duration of 1 or more rounds. That effect ends immediately.
[...]

There are lots of things you can use this maneuver for. Iron Heart Surge your way out of a debilitating spell, or maybe shake off a disease or poison. But what is an effect? Can you use Iron Heart Surge to end hunger or thirst? What about the infirmity of old age? Or poverty?

And it says that "that effect ends" not "that effect ends for you", so if you use it to shake off a spell cast on your whole group, it ends the spell entirely for everyone, not just relieving them of the effect for a round.

Well, Drow and Orcs are blinded by bright light, and dazzled if they linger in it. So if a drow in daylight uses Iron Heart Surge... daylight ends immediately.