teishin raikou (spelling off)

I purchased and played Halo 5 on the night of release and on and off every day since but i have never received the raikou helmet only the armor/

What’s the thing you have to do to get it?

Teishen armour as given out via Xbox live codes a few months back OP, did you not recieve that message?

no i dont believe i ever received a code