Thanee said:Okay, if you have a ring of theurgy [Complete Arcane] and you are a sorcerer, can you have a divine spellcaster (i.e. a cleric) cast a spell, which is also on the Sor/Wiz spell list (i.e. Dispel Magic), into the ring and then cast it using the ring's power?
Thanee said:Hmm... don't have CA with me, so I can't check right now... when using the spontaneous version, does the one who casts the spell into the ring have to wear it, then give the ring back, so the spell can be cast out of it (like ring of spellstoring)?
Each spell stored in the ring is usable as an additional spell known as long as the character has an unused spell slot of the appropriate level. The stored spell disappears from the ring when cast, but the wearer can then have spells not on her spell list cast into the ring to be used again.
Thanee said:Well, I'm pretty certain, that "spell list" there means the "spells known" of the spontaneous caster.
Thanee said:I'm also very sure, that you can only cast such a spell once, and it then disappears from the ring. It's not a contradiction, the first part just means, that you have to expend a spell slot, so you cannot cast the spell, if you do not have an appropriate slot ready (all used up already). The second part then goes on to say, that the spell disappears from the ring afterwards.
Thanee said:For now, I think it works like this:
1)The spontaneous arcane spellcaster has to wear the ring to use it.
2)Whoever casts spells into the ring, does not have to wear it. (debatable)
3)Any spellcaster of any tradition can cast spells into the ring. (debatable)
4)Only spontaneous arcane spellcasters can cast spells out of the ring.
5)If the spell is on the class spell list, the wearer can cast it, using his or her own slots.
6)It doesn't matter, whether the original spell was arcane or divine. (debatable)
7)After a single such casting, the spell disappears from the ring.
8)Prepared casters, on the other hand, have to store the spells themselves, others cannot provide them. (debatable)
Thanee said:The big question here is... do they have to cast (expend) the spells to store in the ring, or do they simply decide, which spells are in there during their daily preparation?
VorpalStare said:This is how I would like to rule it too, if only for game balance reasons, but the description says "Each spell ... is usable as an additional spell known as long as....." Clearly allowing more than one casting per stored spell.

(Dungeons & Dragons)
Rulebook featuring "high magic" options, including a host of new spells.