Well, the description doesn't specify spells must come only from the caster. The last paragraph says the spell use DC, spell attack and spellcasting of the original caster, i'm guessing someone in your party could load it too, for emergencies and whatnot.

I did however missed the part where it says you must be touching the ring when loading/casting spells into it.

It's intended to be cast into the ring, and as you said by touch. So capturing spells even of you got them to touch the ring isn't the idea here if it's supposed to be intentionally cast into the ring, caster should have intent to store

My 2 cents 🧙‍♂️

Could you cast a spell into the ring as a ritual?  If so, would you cast it out with the casting time of the original spell or would it take 10 extra minutes? If so, the ring could allow you to spend time casting rituals into the ring to be cast more quickly if needed (only have 1 minute to prep a place for defense? One tinny but coming up.)

Also, what are the potential uses of a sorcerer using this ring? Could he apply metamagic to sorcerer spells cast from the ring?

That is an aspect I think was done very well in 3.5. They gave pretty good guidelines on how even custom items should be priced.

It's a ring!

I am a little confused, is the point of this item only to allow you to spend your spell slots in advance and, maybe, take a rest to get your spell slots back so that it is as if you have extra spell slots?

I assume that once it's cast and stored, you're able to cast it immediately - it's not like you're genuinely casting the spell, just the imaged spell from the original caster

Quote from Drenix >>

Would it be possible to, as a reaction to use the ring to defend/shield myself against a spell cast at me, storing in it instead, and then just hit them with a Reverse Uno card, using this ring, no?

I would say no, because: the description says "Any creature can cast a spell of 1st through 5th level into the ring by touching the ring..."

So first, unless the enemy caster touches the ring, no, you couldn't reactively defend yourself by storing the enemy's spell.

Second, the wording "can" in D&D always implies that the action is voluntary.  If someone is touching the ring of spell storing and casts a spell, they can choose for themselves whether their spell goes into the ring or gets cast normally.

That's my two cents.  Hope this helps!

Say you put Shadow Blade into the ring. Would YOU have to concentrate on it or does it cancel because it's coming from the ring? 

Quote from Xhool >>

I would have wanted the price tag at the botom of the description

it really doesn't help when I'm trying to figure out the pricing of stuff if it is comissioned

 Just since no one ever replied to this: This item, and items like it, do not have a price tag... like at all, and it's intentional. You aren't meant to be able to buy or comission these as the ability to make these was lost ages ago. You're supposed to find them. Your DM can do whatever he wants, obviously, and that includes setting the price (the DMG has rules for this and suggests between 500gp and 5000gp)

Quote from Shadow_Lycoris >>

I am a little confused, is the point of this item only to allow you to spend your spell slots in advance and, maybe, take a rest to get your spell slots back so that it is as if you have extra spell slots?

 It also lets another person cast the spell.  So Player1 casts Haste into the ring during downtime, and Player2 uses the ring to cast Haste a week later in battle.  Player2 doesn't have to know or prepare Haste, have Haste on thier spell list, or even be a caster.

House Rule: Cantrips can be stored as half level spells.  Yea or Nay?  Any cantrips in particular to be concerned about?

What about rituals aned focus?

Does activating a ring of spell storing count as a use action or a cast action?

It seems common sense that it would be a use action because non casters can do it but if this is he case does this mean that a caster could use the ring and then also cast a bonus action spell for example healing word?

Can you store a “counterspell” in this ring?

There's nothing preventing you from doing so, just be sure to note the casting level and caster's ability when the Counterspell is put into the ring.

Unless I'm missing something outside the description, the counterspell should go off as intended as a reaction when desired.

So, you can put a 5th level spell there.

Could a barbarian use this ring? 

as long as they're not raging, I would say yes.

how does this work with things like concentration, if I store multiple instances of enlarge/reduce for example, can I use them all at once to MEGAMORPH? or would each instance need concentration in which case better to have npc's each cast it for that?

This, IMHO is the most important question about this item and no one has answered it.  

If a Sorcerer gets this ring, can they have two concentration spells running at the same time?  

I imagine that you cant do that, as it would truly be game breaking.

Dual animate objects. 

Sickening radiance plus grease/sleet storm/any group hold spell.