Circlet of the Wyrm (Magic Circlet)

This band of platinum is usually unadorned and magically expands or contracts to fit snugly around the brow of any dragon that wears it. While wearing the circlet, a dragon receives all the powers of a wyrm of the appropriate species. This includes increased damage from breath weapon, increased Hit Dice, increased combat modifier, and decreased THAC0. A dragon automatically receives the innate, magical powers that are normally gained by dragons only when they reach the age category of wyrm. Finally, a dragon can cast as many spells as a wyrm (it doesn't automatically learn any new spells, however, so this might not be a significant benefit).
All of this assumes that the dragon isn't already a wyrm or great wyrm. Wyrm's are unaffected by the circlet, while great wyrm diminish in power while wearing the circlet.
The circlet may be removed at any time, but the mental shock causes the creature to be stunned for 1d4+1 rounds. For each round that the dragon engages in melee combat, there's a 5% (noncumulative) chance that the circlet falls off, stunning the dragon. If the dragon grapples or is grappled by another dragon, the chance increases to 10% per round (noncumulative) as long as the dragons continue to grapple. There is also a oneshot,7% chance that the circlet falls off during a wingover maneuver.
Dragons can wear the circlet only when they're in their own form. Polymorph and shape change spells cause the circlet to fall off, stunning the dragon.
There are legends of a similar circlet of the great wyrm, but this magical item has never been found.
Category:Encyclopedia Magica Magic Items
Category:Magic Items
Category:Magic Circlets