i think it should be like the KOTOR games where your actions can choose your side, your alignment, possibly your tribe.
oooh an idea is forming :D :D :D
for the storyline you're an elf exiled from his or her tribe and you're trying to be adopted by one of the other tribes, wolfriders, sunvillagers, etc or if you're very evil winnowill will adopt you! :twisted:
and depending what tribe you choose, changes the ending in some cataclysmic battle.
whose side will you choose?