Spell Duelist's Siphon
Metal clasps line the spine of this book, and diagrams displaying proper somatic casting forms are etched into its cover.
Activate ↺ (concentrate)
Frequency once per day
Trigger You're targeted with an arcane spell attack and you have this grimoire raised
Requirements You have the Raise a Tome feat
Effect The grimoire attempts to absorb knowledge of the spell targeting you. You attempt to counteract the triggering spell. If you succeed, the spell is absorbed into the grimoire, and the diagrams on the cover change to indicate the somatic gestures and sigils for the counteracted spell. While the grimoire contains a spell, you can spend a spell slot of the same or higher rank as the spell in the grimoire to cast that spell instead, heightened to the appropriate rank (if you spent a higher-rank spell slot). After you cast the spell, it's expended from the grimoire.
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.