This question contains spoilers for Out of the Abyss, hence why this question's title is quite ambiguous as well. If you do not want this adventure spoiled, avoid this question.
So, the Wand of Orcus has this to say about attuning to it (DMG, pg. 227):
Any creature besides Orcus that tries to attune to the wand must make a DC 17 Constitution saving throw. On a successful save, the creature takes 10d6 necrotic damage. On a failed save, the creature dies and rises as a zombie.
And in Out of the Abyss, it says this about the Wand of Orcus (pg. 219):
When Orcus is defeated, he drops the Wand of Orcus (see chapter 7 of the Dungeon Master's Guide), which falls to the ground. A party member can try to grab the wand before Demogorgon seizes it as a trophy, but any such theft draws the attention and ire of the Prince of Demons [Demogorgon]. Angry at its master's defeat, the Wand of Orcus tries to attune itself to the first willing creature other than Demogorgon that touches it. The attunement is instantaneous, allowing the wand's properties to be used during the battle.
My question is this:
Would the quote from the DMG still apply? If the Wand of Orcus wants to be attuned to someone (because it wants to aid whoever is going to fight Demogorgon), would it still try to kill whoever it attempts to attune to?
Or at the very least would the person attuning to it automatically succeed the Constitution saving throw so that they just take some damage rather than being killed outright, since "the Wand of Orcus tries to attune itself", implying it doesn't try to resist, which is presumably what the failed save represents?
I know it doesn't explicitly say this anywhere, but it seem against the intention of the plot that the wand is trying to attune to someone to help them in the fight if it just kills them and thus aids Demogorgon by doing so...
Or is this simply one of those cases where, as the DM, I could choose to just waive the negative effects of attuning to the wand or have the PC succeed the saving throw automatically or whatever else I choose?