Grrl Power #1478 - Achilles backstab (Patreon)

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Not one of those space stations where the atmosphere is mostly sulfur dioxide and aerosolized mercury. 

That sword is going to make Max lazy. Almost all of her opponents this round are magical in nature, except for the guy who got eaten early on, and also the specifically-not-iron-giant, who got blowed up. But if she wants to keep her identity a secret for an extended amount of time, she can't really ever use it outside of the tournament. If she started brandishing that against an army of self-repairing golden golems with exposed gears instead of abs, just to pull an example from the æther, the aliens might be able to put two and two together. 

Bluce says the sword is "functionally-indestructible" because while the sword is for all practical purposes actually indestructible, there's really no such thing. If you stick it between two neutron stars just as they collide, it's probably going to get messed up, no matter what it's made of. People who make magic swords, up to and including gods, aren't usually accounting for truly obscene cosmic forces, unless the sword is specifically designed to cut a star in half or whatever. And even when something like that exists, it's usually metaphorically cutting stars in half. Like the mythos explaining a binary star system. It doesn't help that there's little to no mana in space (outside of the rare but sadly predictable phenomenon which appears once a season on Mana Trek: TNG).

Oh, and to clarify something about Manavore, it doesn't just suck up magic and store it for later, it eats magic, i.e. it digests and annihilates it. It might slowly poop heat or some other byproduct, I dunno.