Solder Knuckle

The Soldier Knuckle (サッダー・ナッカル, Saddaa Nakkaru) is one of the signature weapons of Magnus, First Mate of The Daimaō Pirates and commander of the infamous Demon Horde. The weapon consists of a large and yet thin gauntlet made out of incredibly strong metals. The interesting bit is that it has incorporated Grimaries into its design, specifically Grim Cauldrons, allowing the weapon to attack with magma, increasing its offensive power. When not usually in use it is stored underneath Magnus's left shirtsleeve, allowing for it to be slid down and equipped at a moment's notice.

Appearance
Come on! Tell us what it looks like! Does it look Sinister? Cool Pirate design? Shiny? It's too bright!!! Any decoration? Is it on fire? HOT!

Abilities and Powers
So is it your typical weapon?

Higher grade? Magical powers? Turns into a creature that strike all those who dare to mock it?

History
So........how, what or who made it? How did it come in into your character's possession? Used for good or evil?