A lot of you guys think that the creature at the end of the concept art is a precursor. Well look not everything in Halo is a precursor. I think it is a promethean knight. here is my proof. This creature appears in 1:28 to 1:35, It for sure is not a precursor because #1 these guys are known to have tier 0 technology and created the forerunners. See I just dont think such an advanced race could just scream like an idiot lol.







Now if you look closely the armor is silvery and it looks kind of like the armor that promethean knights have

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this is only my opinion post ur thoughts below