Barbarian

Nazgûl, Balrog, Shelob, that octopus in the first episode that broke the gates, eagles, war elephants (or whatever they were called). You can remember even more things that are definitely more powerful than trolls! :) ;)

The most powerful thing (of what can be repeated and is known to people) is the atomic bomb! In The Lord of the Rings, the most powerful thing is the Ring! All three parts revolve around it, and many die in droves. I'