Cassan's Spellbook

Requires attunement by a Wizard.
While holding the book you may use it as a spell casting focus giving you +1.

The book has 3 charges, and it regains D3 charges every day at dawn.
When you are hit my an attack, you can use your reaction to expend 1 charge and teleport up to 30' to
an unoccupied space you can see.
If your new position is out of range of the attack, it misses you.