Endless Grimoire (True)
When opened, this grimoire has unlimited pages that, oddly, seem almost eager to transcribe spells. Unlike most grimoires, it has no limits to its number of spells. The grimoire's eagerness to contain your spells grants you a +3 item bonus to checks to Learn a Spell if you do so by transcribing the spell into the grimoire. If you use the grimoire during your daily preparations and are capable of preparing spells of the appropriate rank, the grimoire's nature leaks into your mind, allowing you to prepare an additional 7th-rank spell.
Traits
Spellbooks are useful tools for any magic user to write down incantations and runes of power, but where most spellbooks are nothing more than ink on parchment, grimoires have absorbed the magic of the spells within—magic that knowledgeable spellcasters can use to augment their spells.
Something with the magical trait is imbued with magical energies not tied to a specific tradition of magic. Some items or effects are closely tied to a particular tradition of magic. In these cases, the item has the arcane, divine, occult, or primal trait instead of the magical trait. Any of these traits indicate that the item is magical.