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From a Page of Spell Knowledge you can cast both arcane and divine spells. Crafting it requires Craft Wondrous Item feat, which is pretty useful for crafting other cool things. Turned out like both can be lost, but the Page is also slotless.

A Ring of Spell Knowledge costs 1.5 times more gold, only works with spells from 1st to 4th level, and takes a slot. It also has no use for the Oracle: can't hold a divine spell, and there is a special entry against those spells being used by Oracles:

[List of rings] All of them are useful only to spontaneous arcane spellcasters.

What is the reason to use a Ring of Spell Knowledge at all?

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  • \$\begingroup\$ A Page of Spell Knowlege is a slotless item - and as such can be stolen or lost just like any item. \$\endgroup\$ – Trish Aug 6 '17 at 22:29
  • \$\begingroup\$ @Trish Once you learn a spell that way, you know the spell, the spell cannot be stolen from you. Editing the question to clarify. \$\endgroup\$ – Baskakov_Dmitriy Aug 6 '17 at 22:32
  • \$\begingroup\$ @Baskakov_Dmitriy I didnt realize that the page was a consumed item. I figured as long as it was in your possession you basically used it like a scroll, except that the scroll wasnt used up and powered by your spell slot instead \$\endgroup\$ – Fering Aug 6 '17 at 22:41
  • \$\begingroup\$ @Fering Wow. I am rereading the text of the Page, and I am now not sure myself how does it work. Asking another question about it. \$\endgroup\$ – Baskakov_Dmitriy Aug 6 '17 at 22:43
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The items are similar, but there is a difference

Both of them allow spontaneous casters to get another spell to cast. Since they tend to have fairly hard limits on the spells known, this can be a great boon as there are many great low level buffing spells.

The Ring gives access to spells of other arcane casting classes, the Page doesn't

The real difference comes down to this from page of spell knowledge

If the bearer is a spontaneous spellcaster and has that spell on her class spell list, she may use her spell slots to cast that spell as if it were one of her spells known.

Meaning that it can only grant class spells. The Ring of spell knowledge does not have this limitation:

Arcane spells that do not appear on the wearer’s class list are treated as one level higher for all purposes (storage and casting).

The Page may hold a divine spell, the Ring cannot

Also, the page can be either arcane or divine, while the Ring is only arcane.

You can change the spell inside the Ring, but not on the Page

So why a Ring when it limits you to only arcane spells? Because you are able to change what spell is loaded into it (supported by this answer). So keep a scroll and if needed copy its spell into the Ring and there you go.

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  • \$\begingroup\$ I have edited your post to improve some formatting and make it a bit easier to read. If you don't agree with my edits, please feel free to roll it back. I am accepting your answer even though we don't know how does the Page itself work, because that seems to be kinda irrelevant. Thank you very much for your answer. \$\endgroup\$ – Baskakov_Dmitriy Aug 6 '17 at 23:23
  • \$\begingroup\$ @Baskakov_Dmitriy It tells me when an edit has been made to a post, so comments are not needed. I am aware that my use of language is not always the best, and I can't even claim its because its a second language to me, lol. \$\endgroup\$ – Fering Aug 6 '17 at 23:28
  • \$\begingroup\$ Well, to me neither. :) I comment because I have seen high-rep guys commenting when they edit, and because I now have (again) the privilege to edit without peer review for some time already. \$\endgroup\$ – Baskakov_Dmitriy Aug 6 '17 at 23:55
  • \$\begingroup\$ I'm forced to downvote. You claim that the Ring cannot hold a divine spell, but that's something that requires a citation, since no version of the official rules I could find supports this. \$\endgroup\$ – Gloweye Jun 22 at 8:24
  • \$\begingroup\$ @Gloweye The ring mentions Arcane spells repeatedly and divine not once. It has rules for how arcane spells are added, and none for divine. Therefore, without rules for divine spells, they cant be added. \$\endgroup\$ – Fering Jun 22 at 11:22
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Ring of Spell Knowledge

Advantage 1: More possible spells

Primary advantage of the Ring of Spell Knowledge over the Page is that it lets you cast spells not on your class list.

A ring of spell knowledge is only a storage space; the wearer must still encounter a written, active, or cast version of the spell and succeed at a DC 20 Spellcraft check to teach the spell to the ring. Thereafter, the arcane spellcaster may cast the spell as though she knew the spell and it appeared on her class’ spell list.

Emphasis mine. RAW, it allows any spell, even those usually restricted to divine casters. When casting it yourself, it will be considered an arcane spell regardless of where you got it.

Advantage 2: Switching out spells

An important advantage of the ring is that you can switch out the spells. Just have a stack of scrolls, and you can switch the spell out at will. Scrolls don't get consumed when doing this.

If you have other spellcasters in your party, they could also cast them for you to put into the ring, and you can Take 10 on that DC 20 Spellcraft check. As Intelligence isn't a stat spontaneous spellcasters usually invest in, this may require some skill ranks to get reliably right in a single casting.

Disadvantage 1: Off-class arcane spells are penalized

Arcane spells that do not appear on the wearer’s class list are treated as one level higher for all purposes (storage and casting).

This doesn't affect stored divine spells. Not much to say about it, honestly. This might cause you to seek out divine versions of those spells if available to a divine class.

Disadvantage 2: Level is capped.

The highest available ring in RAW is level 4. Period. GM's may be willing to allow higher rings, but you can't count on that.

Note 1

RAW, you'd need a level 3 ring to store cantrips:

A ring of spell knowledge I can hold 1st-level spells only, a ring of spell knowledge II 1st- or 2nd-level spells, a ring of spell knowledge III spells of 3rd level or lower, and a ring of spell knowledge IV up to 4th-level spells.

But I honestly can't imagine why a GM wouldn't let you put it in a level 1 ring. And you probably have a LOT more important uses for a ring slot than paying 13 500 gold to gain access to a single cantrip.

Note 2

RAW, divine spells are allowed into the ring. There is some discussion on some forums about whether divine spells could be allowed, but no official word as far as I could find.

The most common argument against I found was "well, obviously".

I think it is intended to allow this on purpose. Otherwise, the combination of taking a slot AND being more expensive doesn't make sense with Paizo's own design philosophy. Normally slotless items cost double. Accounting for that, the Ring is three times as expensive as a Page. Just switching out spells doesn't make up for that huge disparity. Those few arcane spells not on your list aren't that gamechanging either. But access to normally divine spells like Cure Critical Wounds or Restoration is worth it.

I suspect that the allowance of divine spells is also the reason that the maximum level for a ring is limited. Otherwise putting Raise Dead in the Ring becomes an option, which might be encroaching on the divine caster territory a bit much.

Still, you might want to ask your GM for an explicit ruling about how it will be treated on your table.

Page of Spell Knowledge

Advantage 1: Slotless

Primary advantage of the Page is that you can hold unlimited of them. No downsides.

Advantage 2: Accessibility

If you have Craft Wondrous Item, can just make them yourself. You will take a +5 to craft DC for not knowing the spell. This also halves the cost compared to having to buy them.

Advantage 3: Divine Spontaneous Casters

The page can be used by divine spontaneous casters. Obviously, if the Ring is an option, this isn't an advantage for you. But it's worth a mention for all those Oracles out there looking to broaden their understanding.

Disadvantage 1: Smaller spell pool

Pages only work if the spell is on your class' spell list to begin with. "knowing" a spell doesn't do anything for you if you don't have it there. This means that a Sorcerer cannot learn Cure Light Wounds this way, even if another arcane caster (like a bard) crafted the page with that spell.

Disadvantage 2: Expensive

Page cost adds up fast, especially on higher levels. Assuming you craft them yourself, the 500 and 2000 gold for levels 1 and 2 are doable, but costs increase fast. 40 500 gold for a level 9 spell is expensive.

Disadvantage 3: No cantrips

RAW, there's no provision that lets you put a cantrip into a Page of Spell Knowledge. But I'm confident most would let you either make one for the price of a level 1 spell, or even for just 250 gp, which the quadratic formula would give for a level 1/2 spell. (often used for item creation with spell level 0)

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