Ring of Spell Holding

This intricate gold band, when slipped on a character's finger, extends the duration of a spell in effect on the character indefinitely - as long as the ring is worn.  Only spell effects that have a duration other than 'Instantaneous' can be so held.  If the ring is removed once the spell's normal duration has expired, the spell effect ceases immediately.  Eighty-five percent (85%) of these rings work on Magic-User spells only.  Rarely (15%), such rings will work with both Magic-User and Cleric spells.  One such ring can maintain only a single spell effect, so if a character has Flight, Protection from Evil and Bless in effect when the player indicates that the character puts on the ring, the player must specify which of the effects will be held.  The other effect(s) dissipates normally at the end of the spell's normal duration.