Magic Items

Headsman’s axe
Weapon (greataxe), very rare
You have a +2 bonus to attack and damage rolls made with this magic weapon.
The headsman's axe is a weapon that can be employed only by a creature at least as strong (Str 25 or higher) and massive (Huge size) as he is. It deals 3d12 slashing damage on a hit (plus Strength and Magic bonus).

Mistral Mantle
Wondrous Item, Very Rare (Requires Attunement)

This thick, fur-lined cloak has the frost rune stitched on the hem in silvery blue thread. Frigid wind swirls around the cloak, regardless of the weather.
While wearing this cloak, you have resistance to cold damage. Additionally, when you move within 5 feet of a creature, you can cause the cloak’s cold wind to buffet the creature. The creature must succeed on a DC 14 Dexterity saving throw or take 1d6 cold damage and have the prone condition. A creature can be affected by the mantle only once during a turn.
Invoking the Rune. As an action, you can invoke the mantle’s rune to cast the Sleet Storm spell (save DC 14) with it. When you use the mantle to cast the spell, the area of the spell isn’t difficult terrain for you, and you can see through the storm, ignoring the normal penalties of a heavily obscured area.
Once the rune has been invoked, it can’t be invoked again until the next dawn.

You gain a +1 bonus to attack and damage rolls made with this magic weapon. When you hit a dragon with this weapon, the dragon takes an extra 3d6 damage of the weapon's type. For the purpose of this weapon, "dragon" refers to any creature with the dragon type, including dragon turtles and wyverns. This item can be found in the Dungeon Master’s Guide. Made of what appears to be roughly crafted pig iron with a crude leather haft, this enormous greatsword possesses a bold Davek rune at the base of both sides of the blade which reads “Wyrmripper”.