The Book Covers are at the core of the Spell Binder. They allow to give your binder special properties and effects, similar to how Armor Threads work. You can use an Alteration Table to slot up to two covers into the Spell Binder.
Ars Nouveau – Blank Thread
Book Cover : Cheap Damage
Cover Sigil for the Spell Binder. Will greatly discount the spells cast from the equipped book but heavily reduce their damage.
Book Cover : Slow Power
Cover Sigil for the Spell Binder. Will increase the damage of the spells cast from the equipped book but heavily reduce their speed.
Book Cover : Sharp Pages
Cover Sigil for the Spell Binder. Will increase the melee damage of the Spell Binder if used as a weapon.
Book Cover : Heavy Cover
Cover Sigil for the Spell Binder. Will increase the knockback of the Spell Binder if used as a melee weapon.
Book Cover : Wheel of Fortune
Cover Sigil for the Spell Binder. Will randomly add positive augments to effects of your spells when equipped.