Hey there. You only need the armour for the final mission, 'Beyond'.
If you mean this text, "To pass beyond the Pyramid's warding and discover what lies within, you'll need to wear a full set of Dreambane armor. Take the first step and hunt the Nightmare of Omnigul."
It is saying "You need a full set, this is next step towards obtaining it" - you do not need the full set, or to wear any piece, to do the Omnigul step. Just try and do it, see what happens.
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Thanks yeah first try and it bugged and the barrier wouldn't go down