Okay, now I don't know if I just have bad luck, but I've completed every phase of the raid, both normal and hard, for a total of 18 times between 2 titan characters and STILL haven't received the raid boots. I think all armor pieces should drop within 15 attempts. Doing the raid for as many times as I have with my titans is beyond frustrating when I still haven't received the boots.
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Raid drops are random. It is possible to not get the exact item you want.