Apotheosis Veil is amazing for the Crota part, as is any other helmet with the "orbs for health" perk.
It works fine with Fireborn, rather Fireborn isn't good for Crota due to the over soul. Veil + Fireborn work great together for the rest of the raid.
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Fireborn negates the need for the veil because if you die, you haven't used the veil correctly and another helm that has the health on orb perk is light beyond nemesis.