Questions - Diaspora IV

[TF - The Fortress]

I used to allow that...of course it burned it out of the book and was essentially treated as a scroll. So the spell would have to be researched again and couldn't be prepared again during that adventure.

The constantly having to re-research the basics put a quick stop to it.

(Was using Complete Wizards guide with something like a week per level per spell to begin research).

[AaH - Avicerra al Hamam]

On purplewurm I found this about copying of spells under Master. Cant find anywhere that you can or can not prepare from other spell books.

Copying from Spell Books
The second way to acquire new spells is to copy them from the spell books of other wizards. A character can copy from other player characters (if they will allow it), pay NPC wizards for the privilege (see Chapter 12 : NPCs), or take them from captured spell books. When copying spells, a character must roll to see if the character can learn the spell. No character can copy without magical aid of a spell of a level he cannot cast.

[YK - Yuri Khavlor]

[+] PHB under wizard class

Whenever a wizard discovers instructions for a spell he doesn't know, he can try to read and understand the instructions. The player must roll percentile dice. If the result is equal to or less than the percentage chance to learn a new spell (listed on Table 4), the character understands the spell and how to cast it. He can enter the spell in his spell book (unless he has already learned the maximum number of spells allowed for that level). If this die roll is higher than the character's chance to learn the spell, he doesn't understand the spell. Once a spell is learned, it cannot be unlearned. It remains part of that character's repertoire forever. Thus, a character cannot choose to “forget” a spell so as to replace it with another.
A wizard's spell book can be a single book, a set of books, a bundle of scrolls, or anything else your DM allows. The spell book is the wizard's diary, laboratory journal, and encyclopedia, containing a record of everything he knows. Naturally, it is his most treasured possession; without it he is almost helpless.
A spell book contains the complicated instructions for casting the spell -- the spell's recipe, so to speak. Merely reading these instructions aloud or trying to mimic the instructions does not enable one to cast the spell. Spells gather and shape mystical energies; the procedures involved are very demanding, bizarre, and intricate. Before a wizard can actually cast a spell, he must memorize its arcane formula. This locks an energy pattern for that particular spell into his mind. Once he has the spell memorized, it remains in his memory until he uses the exact combination of gestures, words, and materials that triggers the release of this energy pattern. Upon casting, the energy of the spell is spent, wiped clean from the wizard's mind. The wizard cannot cast that spell again until he returns to his spell book and memorizes it again.
Initially the wizard is able to retain only a few of these magical energies in his mind at one time. Furthermore, some spells are more demanding and complex than others; these are impossible for the inexperienced wizard to memorize. With experience, the wizard's talent expands. He can memorize more spells and more complex spells. Still, he never escapes his need to study; the wizard must always return to his spell books to refresh his powers.

"Whenever a wizard discovers instructions for a spell he doesn't know, he can try to read and understand the instructions." (Understand to add to spell book, not memorize) (House rule precludes this as a source for learning spells regardless)

" it is his most treasured possession; without it he is almost helpless." (There are no substitutes to your personal spellbook)

"Merely reading these instructions aloud or trying to mimic the instructions does not enable one to cast the spell." (You have to prepare a spellbook as a personal aid for you to be able to memorize)

Spellbooks are personal to a wizard, and cannot be substituted. Spells cannot be memorized from scrolls.

[TF - The Fortress]

On purplewurm I found this about copying of spells under Master. Cant find anywhere that you can or can not prepare from other spell books.

Copying from Spell Books
The second way to acquire new spells is to copy them from the spell books of other wizards. A character can copy from other player characters (if they will allow it), pay NPC wizards for the privilege (see Chapter 12 : NPCs), or take them from captured spell books. When copying spells, a character must roll to see if the character can learn the spell. No character can copy without magical aid of a spell of a level he cannot cast.

To learn a new spell under those same rules is 2 weeks per spell level.

It also requires a lab, library, and extensive materials and costs involved per week (DMG, Complete Wizards Book, or Spells & Magic).

[DM Juan]

It depends which rules you want to use (there are varying ones), but since copying a spell into a spellbook is clearly at least as hard as scribing a spell from a spellbook into a scroll, and scribing scrolls defines the timeline as 1 day per spell level, 1-2 days per spell level seems a reasonable time to copy a spell into your spellbook as a basic rule of thumb.

The research requirements are usually meant, in my reading of it, for "new" spells that you invent yourself (which are not allowed in this game).

[TH - The Hunt]

So long as we're talking about quirky rules about spells, in this edition it's explicitly not possible to purposefully 'forget' a spell to prepare another in the same slot, they have to be expended deliberately. This can be inconvenient, though I guess a workaround, for spells that have no safe way to be expended harmlessly, might be that the wizard could arrange to have someone disrupt their spellcasting so that the spell is lost without effect.

[DM Juan]

I have been allowing people to "forget" spells, and memorize new ones at 10min per spell level required to do so. Releasing the spells somewhere is another way of doing it, that could work too.

[MaH - Meganno al Hamam]

From phb. (Magic about copying spells) When your character attains a new level, he may or may not receive new spells. This is up to your DM. He may allow your character to return to his mentor (provided he departed on good terms!) and add a few spells to his book. It may be possible for your character to copy spells from the spell book of another player character (with his permission, of course). Or he may have to wait until he can find a spell book with new spells. How he gets his spells is one of the things your DM decides.

[MaH - Meganno al Hamam]

But my case is: the wizard learn the spell in preparing it from another spellbound and making a Int % check. If he learns it he can cast it which erases the spell from his mind. Or he can write the spell down which will cost a lot and takes 1/2 days per lvl.

[TH - The Hunt]

Learning the spell and preparing the spell aren't the same thing. It's not possible to prepare the spell without having learned it and added it to your spellbook. Spells are always prepared from your spellbook, never from other sources.