What do you mean? Where we use the other night warriors to save her? Tyrande says something like one last time or some shit in darnassian doesn't she? Implying she knows this is gonna kill her. We already knew the night warrior power eventually killed everyone so just because Elune dropped her power lvl doesn't mean Tyrande was safe from dying from the power without our eventual intervention.
Idk if it would be elf only since the other night warriors are different races. I'd assume they would have a dual wield/glaives spec and a ranged bow spec since both Tyrande and Sylvanas used a bow. Probably a heal spec as well. I think it would end up being a class so that bows and glaives aren't just 1 class exclusive items.