fireinthedust
Explorer
Sunsword, a +1 longsword that glows in the brightness of the sun, gaining power as it does. As long as the Sunsword is exposed to sunlight for 1 hour it glows with the effect of the light spell for 8 hours or until its special ability is discharged or the wielder commands it to stop(can be restarted as an action). Additionally the Sunsword deals maximum weapon damage to any creature it hits that possesses darkvision. Special: 1/day as long as the Sunsword is glowing from its light ability, the wielder can release a blast of daylight as per the spell. After which the sword functions as just a +1 longsword until recharged in direct sunlight.
That is a sweet sword! Did you design that, or is it from a module?
I'd only change the Darkvision bit to "vulnerable to sunlight", otherwise it's effective against, say, Dwarven Clerics of Pelor.