While I'm not sure about helm of saint 14's special ability, a strikers flash bang is capable of blinding some bosses like omnigul and I believe it works on yellow bar servitors as well.
Just a little destiny fun fact from on titan to another. Keep on showing those fallen the light, guardian.
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I'm well aware that Flashbangs and Saint-14 work on small boss enemies like Omnigul. I have used Starless Night to much effect during Arc Burn Nightfalls with my Arc Felwinter's Lie. But for some reason the ONLY enemy that should be affected by Starless Night that isn't is Servitors... of any kind.
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That is a bit strange considering there's nothing inherently different between servitors and other basic enemies. I agree, it must have been an oversight on Bungie's part.