Brass horn of Valhalla

Rare

You can use an action to blow this horn. In response, warrior spirits from the plane of Ysgard appear within 60 feet of you. These spirits use the berserker statistics' rom the Monster Manual. They return to Ysgard after 1 hour or when they drop to 0 hit points. Once you use the horn, it can't be used again until 7 days have passed. Brass 3d4 + 3

Adamantine Mace of Smiting

Rare

You gain a +1 bonus to attack and damage rolls made with this magic weapon. The bonus increases to +3 when you use the mace to attack a construct. When you roll a 20 on an attack roll made with this weapon, the target takes an extra 7 bludgeoning damage, or an extra 14 bludgeoning damage if it's a construct. If a construct has 25 hit points or fewer after taking this damage, it is destroyed. The once-fine haft of this club has long-since gone to soggy rot; even the leather wrapping its pommel isn’t enough to stop it from soaking through the wearer’s gloves. The adamantine head of the mace is carved to resemble the giant rune Rün (ruin). Upon striking a construct with the mace, it unleashes a shower of gold sparks. Adamantine Weapon. Melee weapons made of or coated with adamantine are unusually effective when used to break objects. Whenever an adamantine weapon hits an object, the hit is a critical hit.