Eris is his sister she used us to kill him. She is known to hide amongst oryxs enemy. The cunning.
My theory anyway
English
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Just scramble the letters and you get Seir(the s is silent) therefore it sounds like eir aka a hive god
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Maybe savathun possessed her or infected her with a worm, but eris was a guardian before she went to the hellmouth
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I was thinking the same thing. Grimoire is some freaky shit
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Wow.. You heard it here first Guardians!