Taeko-3, collaborating with her fellow Hunter Uzoma Vale and a Warlock known as the Stoic, built the Zen Meteor rifle on the premise that it would allow the user to focus their mind's energy into a single point, converting this energy spike into matter and subsequently, ammunition. A weapon that grows stronger with greater focus and serenity.
She later perished, on the reclaimed Saturnian moon Titan, allowing the lulling Song of Savathûn to strip her light, and subsequently, turn it into ammunition, for our Guardian, to put an end to the wretched liturgy.
[spoiler]I'm not sure if this will get taken down for simply restating a bit of the lore, but I feel like this is something to know.[/spoiler]
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Well damn...