Praedyth

Praedyth was a Warlock who had been part of Kabr's fireteam during their assault on the Vault of Glass. Praedyth himself was believed to be a myth; Praedyth's Timepiece and Praedyth's Revenge are the only pieces of evidence of his existence, until the Vanguard discovered a message coming from the Vault.

His fate is explored in the Story Mission Unsealed Paradox. After fighting through Taken, the Guardian discovers Praedyth's corpse, long dead, trapped deep within the Vault of Glass.

Quotes

 * Praedyth's fall isn't over… because it hasn't happened yet… and it will happen again.
 * "He skipped like a stone on time's ocean. This is what's left." - Unknown