One of RuneScape's oldest quests, Shield of RuneScape gold Arrav, introduced players to the novel idea of cooperation in a solo MMO. To complete it, you need another player—each joining opposing gangs—to help you retrieve the two halves of a powerful shield.

Sounds easy? Try finding someone in the opposite gang who's online and willing to help. Even seasoned players remember scouring Varrock, begging for a partner because everyone joined the same faction.

It's short, but the sense of OSRS gold community and shared accomplishment sticks with you, especially if you both managed to finish it at the same time.