Hypersmurf said:
Out of curiosity, where do you find that a Ring of Spell Storing is a command-activated item?
The ring states that it communicates the spells stored to the wearer, and that 'the wearer can cast' them (with no M or XP component and no gestures).
I would read the casting of a spell from the ring to provoke an AoO as normal, unless cast defensively... and that no prior knowledge of any command word is necessary. Once you put on the ring, you can cast the spells that it has identified to you as being available.
-Hyp.
Well, the entry for activation methods of items indicates that there's only the four activation methods; the example under the Ring of Spell Storing includes a barbarian casting spells (which rules out Spell-Completion and spell trigger); that leaves Use-Activated or Command Word. Now, I like the idea of command word - you order the spell out - but I can see a decent argument for Use Activated. Of course, there's that nifty line under use-avtivated: "Unless stated otherwise, activating a use-activated magic item is either a standard action or not an action at all and does not provoke attacks of opportunity" which, in the case of casting a spell out of a ring, is very, very much like command-word, to the point where the difference hardly matters.
I suppose you are basically taking the reading where the ring is continuously active, and makes you effectively a spellcaster while the ring is worn, with a spells prepared list consisting of that which is in the ring at this moment. Which leads to an interesting question - would wearing the ring grant you the ability to use a wand of a spell that is currently stored in the ring?
Also - it makes a ring of spell storing priceless to a Mage of the Arcane Order - pull a spell from the SpellPool, cast it into the ring. You now have that spell stored in a manner where it can be maintained indefinately, but is treated as a normal spell you can cast. Make a scroll of the spell in the ring using up the spell from the ring itself. Here the Wizard and Sorceror diverge - Wizard scribes it into a spellbook, gaining a known spell for the cost of the scribing and the scroll, Sorceror just has it for later casting - but either way, priceless, and a very big power boost. Could also be used to manufacture very nearly any Sor/Wiz item for a member of the PrC.
Further, the entry for command-word activation says it's the default unless another method suggests itself - to you, the ring's description suggested continuous/granted abilities - didn't to me. Happens.