Thor and Thanos are two of the most powerful beings in the Marvel Universe, but both are on opposite sides of the balance. Thor, the son of Odin and Gaea, is the rightful ruler of Asgard. He has worked with the Avengers to save worlds from conquering hostile aliens, Bifrost, and so on. Even from his brother, Loki. Thanos on the other hand, is a mad titan, the father of Gamora and Thane, and wants to sacrifice half of the universe to court Death. 

Warning! Proceed at your own risk! Infinity Gauntlet (2015), Thor #6, Thor #29, and Thor #33 (2019) spoilers ahead!

Thor learns about the existence of a secret black Infinity Stone, a seventh stone. And what’s more intriguing is that it has a connection to Asgard going all the way to his grandfather, Bor Burison. Thor has a vision he received from Black Winter, and in that, he sees Thanos wielding all six infinity stones embedded within Mjolnir and a Seventh Stone within a new black gauntlet.

Learning about Bor and his sorcerers creating a stone embodying Death, Thanos arrives to confront them and own the stone and a war engulfs in the forbidden wasteland.

Bor and his sorcerers used the souls of the Asgardian deaths as fuel on the heavy piece of shell. It once held the Galactus Seed along with the Eternal flame of Muspel from the depth of Muspelheim to create the Death Stone, a weapon with the power to control life and death, and…

Death Stone (Yellow): A Secret Wars tie-in The Infinity Gauntlet  (2015), Anwen Bakian uses the Reality Stone and creates the Death Stone tricking Thanos and defeating him.

…what created was…

…a child tied to Death. 

As we know, Infinity Stones can be alive, and if that is the case, is Hela the living Infinity Stone of Death!?

^{Pic Credits: Courtesy of Marvel Comics}