D&D 5E Can an undead character be restored to life?

[FormerlyHemlock]

Revivfy doesn't work as the spell to create zombies, animate dead, takes an hour and revivify can't return beings that were dead for more than a minute. If the undead is created in a faster method, it would work by RAW.

Nitpick: Animate Dead only takes a minute in 5E.

 

[Zefus]

True resurrection was updated and now says that if they were undead they return to a non-undead form, which implies that resurrection won't do the same, true resurrection means that it's always possible to get someone back, if their souls is free, despite the extreme price

 

[R_J_K75]

I see True Resurrection works on message board threads too.