Weapon (warhammer), artifact (requires attunement)
You gain a +3 bonus to attack and damage rolls made with this magic weapon.
In addition, while attuned to the warhammer it deals an additional d8 thunder damage and d8 lightning damage. Further, it may be thrown with a range of 50/150 feet and will always return to your hand by the end of your turn. Finally, as a bonus action you may smash the ground at your feet and all creatures within a 10 foot radius must make a DC 14 Dexterity saving throw or be knocked prone. You may not use the smash ability again until you finish a short or long rest.
"Then he gave the hammer to Thor, and said that Thor might smite as hard as he desired, whatsoever might be before him, and the hammer would not fail; and if he threw it at anything, it would never miss, and never fly so far as not to return to his hand; and if be desired, he might keep it in his sark, it was so small; but indeed it was a flaw in the hammer that the fore-haft was somewhat short."