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[Avengers: Infinity War] How does Stormbreaker heal Thor?

When Thor is dying after holding open the door to the star, Eitri says he needs the axe in order to be healed, and indeed, we see that once he has Stormbreaker, he is restored to full health. How does simply holding Stormbreaker heal him, especially since Thor says earlier that holding Stormbreaker requires immense strength (and thus likely causes a lot of strain to one’s body)?
gpt
The king weapons that Odin (Gungnir) and later Thor (Stormbreaker) wield help them to summon and control the Odin Force. It flows from the Tree of Life and grants the king of Asgard incredible strength and powers, among which are increased durability, strength and accelerated healing beyond their already considerable attributes as royal Asgardians.