originally posted in:The Ashen Conflux
The Descendants were in the Vault of Glass. The Vault of Glass supposedly keeps everything in it locked out of time. We breached it because of the Aegis helping us. These Descendant Vex are just the Vex from the future version of the Vault. Unless I'm wrong.
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They are the vex from the future. As in there model changed some how, and they changed on a fundamental level. Not just in the vault.