Mialma, The Devil You Know

Weapon Magical, Versatile Legendary (this item requires attunement) [Requires attunement by a Lawful creature.]

The Devil You Know is crafted from Celestial Steel made from Avernel's own angelic essence. You gain a +3 bonus to attack and damage rolls made with this magical weapon. This weapon also deals an additional 2d8 cold damage on a hit. While attuned to this spear the user gains resistance to radiant damage. Tribute.:

Before making an attack roll you may pay 5 hit points to either; gain advantage on your attack roll, or gain an extra 1d8 of radiant damage.
Pay 10 hit points to cast ray of frost (3+dex modifier+profiency bonus Vs AC) dealing 2d8 cold damage on a hit.

Celestial Steel.: When attacking fiends instead of a +3 bonus to attack and damage rolls, it is a +5 bonus.