Quote Originally Posted by navar100 View Post
But will the players be ok with it? Dailies are to be used. If they never get to use them because they'll never use them again, they have right to object. Dailies are not obligated to be used only against the BBEG at the end of the adventure. Players aren't having a choice of how often. Your house rule is forcing them to use it once and it's gone forever until next adventure.
The magical thing about "per adventure" abilities is the DM decides what an "adventure" is. You're assuming an entire campaign counts as one adventure, but I'd count it as like, 5-10 adventures. Like so:

1. Journeying to the BBEG's castle.
2. Sneaking into the castle to steal his magic artifact.
3. Escaping from the castle after you're caught stealing the artifact.
4. Traveling the long road to a far-away good wizard's tower. (With fighting a few bandits along the way.)
5. Fighting off some mooks who followed you all the way there and are now assaulting the tower.
6. Chasing the mooks after they steal the artifact back to their secret lair.
7. Fighting the mooks inside their lair to get the artifact back so the wizard can unlock its True Power.
8. Back to the BBEG's castle, this time with a weapon that can kill him for good.
9. Fight through the BBEG's much-more-powerful elite minions.
10. The final confrontation.

All these parts consist of 3-4 combat encounters, tops. (Except the last one, which is just a single encounter. If the battle is really important and climactic though I'd count it as an entire adventure all by itself.)