Balrog vs. Night King/Undead Army/White Walkers

Same circumstances as the final battle in Season 8
Durins Bane has to kill every wight, White walker, Viserion, and the Night King
Bonus round: Durins Bane has to kill all of the fighters (Humans as well)

Does it win

???

No

Probably, yeah.

Balrog shit stomps.

Can’t remember, how does Gandalf kill the balrog?

Stabbed him into a lake

With a lightning imbued sword. Otherwise the Balrog is basically smoke and fire given form. He can just swing his whip endlessly.

Night King extinguishes the flames and smites the ruin upon the mountainside.