Book of Unlimited Spellcasting

This ancient book seems to be ancient research
manual on the origin of spellcasting. The old
book is cover is made of an old dark leather,
and has a blood-covered pentagram etched
into the cover. The inside of the book
surprisingly, show no signs of wear.When
you cast a cantrip that deals damage while
holding this book, you deal 1 additional point
of damage per die. This bonus damage is the
same damage type as the damage from the spell.