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So, I know with the old 5th Ed. Daemon Codex (when all daemons had Eternal Warrior), a Nemesis Force Weapon was really the only way to Instant Death a Daemon.

Now, in 6th, since EW is no longer innately part of the Daemon USR, what happens if my GUO is rocking Iron Arm or Endurance (and is thus given EW)...does the Daemonbane SR from Nemesis weapons take precedence, or does the EW from the psychic power?

Well, Instant Death rule says any model that meets the conditions has its Wounds reduced to zero and removed as a casualty. Demonsbane causes the demon to make a leadership roll at the end of the turn if it took a Wound from a Nemesis Force Weapon, if it fails it is removed as a casualty. Not seeing a real difference between the two so I don't see why Eternal Warrior wouldn't be protected from the Demonsbane or the force weapon effect of a Nemesis Force Weapon.

If the GUO has EW, then it ignores the Force Weapon part of the Nemesis Force Weapon, as that causes Instant Death.

However it does not ignore the Daemonbane Special Rule, because that does not cause Instant Death, rather removes as a casualty.

Ah, thanks guys.

as above, the force part of nemisis weapons is ignored,
as it causes instant death, which is ingnored by EW,

the second part, demonbane, simply removes the pysker/demon as a casualty, which is NOT something EW protects against.