SPOILER! Kattints ide a szöveg elolvasásához!forras: DA:O wiki
The real benefit is not that it gives the bard a big stamina charge, but that it gives all 4 party members a little mana/stamina charge. However, the charge is so small, to regenerate +0.5 mana/stamina points per second one would need 60 cunning that works out to 1 or 2 extra ability uses for everyone.
This ability will likely be of no benefit to the rogue. A rogue with 40 cunning will require fights to last more than two minutes before getting any net benefit, as it will take that long with the slow regeneration rate just to recoup the 50 stamina cost of sustaining it.