what will happen
the elven spell casters will find arya/ eragon using scying or at the varden in the burning plains.
oromis will perish along with gleadr, before oromis dies he may tell eragon things that may help him in his struggle
oromiss may bestow naegling to eragon
the root under the menoa tree is a weapon to defeat galbatorix like the name to the ancient lauguage or a weapon from the very forces of nature
helgrind as it is offical is the cavern in which the vault of kuthian is at or at uru baen because it was once an elf city and galbatorixs grows in power because he takes souls out and grows in power, the souls that may rise and grant him power may be eragon the first or brom or vrael or even oromis and glaedr may do the same to saphira or the riders aboves dragons
eragon may be captured by murtaugh and kills him or escapes, eragon kills galbatorix and decides to leave alagaesia to reborn the riders in vroengard

This is irrelevant to anything...no one knows, and there are plenty of topics about what will happen.

*locked*