You gain a +1 bonus to attack and damage rolls made with this magic weapon.
And +2 bonus to attack and damage rolls against a Undead.
This weapon was created for educational purposes of item crafting, and is referenced in a dndbeyond.zendesk discussion thread.
Proficiency with a warhammer allows you to add your proficiency bonus to the attack roll for any attack you make with it.
Notes: Bonus: Magic, Favored Enemy: Undead, Damage, Combat, Versatile