Oscillating Power Hammer

This weapon appears to be made of silver, wrapped in coils of golden wire. The heavy metal head's surface is encrusted with citrines arranged in concentric circles about the base. When swung in combat, waves of yellow light travel up and down these gems, rising in brightness as the weapon's power steadily increases. Powers: The oscillating power hammer begins combat as a +1 dwarven battle hammer of prowess, and remains in that state until it deals damage. Beginning on the ensuing round, the weapon's bonus increases by +1 each round until it reaches a total of +5. The jewels on its surface increase in brightness as the weapon's power grows. Once the wielder deals damage, the hammer's power increase continues regardless of whether or not an attack roll succeeds in any ensuing round. Once the hammer reaches a +5 enhancement bonus, the oscillation decreases by -1 each round until the weapon returns to its original +1 state, where it must remain for 2 full rounds. The oscillation process can then begin anew, starting with the next damage dealt.