The Profane Spellbook grants you the following features:

CHANNEL CORRUPTION

You can expend one use of your Channel Arcana feature to take the Magic (Spellcast) action with one of the spells of level 5 or lower within your Profane Spellbook without providing a spell slot.

DEMONOLOGIST LORE

You have advantage on ability checks related to information about fiends.

FORBIDDEN TONGUE

You can speak, read, and write Abyssal and Infernal.

UNHOLY CONNECTION

You share telepathy with fiends that you can see or hear.

FIEND FOLIO

When you take the Magic (Spellcast) action to cast the planar binding spell against a fiend creature and say its true name, the fiend is cursed with soulbound and teleported into an empty page of your Profane Spellbook. While carrying your Profane Spellbook with at least one fiend bound to it, you gain the following features:

BREAK THE CHAIN

You can take the Magic action to end the cursed (Soulbound) condition on a fiend within a page of your Profane Spellbook of your choice, cause it to become banished, and gain advantage on saving throws against spells and other magical effects for 1 minute.

BOOKBOUND SUMMON

You can take the Magic action and choose one fiend within a page of your Profane Spellbook to be summoned to an unoccupied space you can see within 60 feet of you. While summoned through this feature, the fiend gains the following features:

BLAZING INFERNO

The fiend can take an action to deal fire damage equal to your wizard level to a target of your choice.

FORBIDDEN OPPORTUNITY

Whenever a creature leaves the fiend's reach, the fiend can take the Attack action as a reaction against the creature.

SPELL DEPTH

When you take the Magic (Spellcast) spell to cast a wizard spell, the fiend can take a reaction to be the origin of the spell.

SPELLWARD BOUND

The fiend gains temporary hit points equal to your wizard level + your Intelligence modifier. Once the fiend gains temporary hit points this way, it can't do so again until you finish a long rest.

DARK LORE

You gain a bonus to any ability check you make related to recalling information about fiends equal to the number of fiends bound to your Profane Spellbook.

TELEPATHY

You share telepathy with the fiend.