In Infinity War Thanos uses a small double-bladed knife to demonstrate how perfectly balanced it is. When we see Thanos again in Endgame, the knife has grown into a giant double-bladed sword.
Infinity +1 Sword - TV Tropes
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The Ultimate Guides for Blade & Soul Revolution-Game Guides-LDPlayer
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Avengers: Endgame wouldn't exist without Blade – the original Marvel film | The Independent
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Marth - Fire Emblem Wiki
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First Look at Thanos's Hot toy from Endgame. : r/MarvelStudiosSpoilers
New legendary weapons are so nice : r/bladeandsoul