You can use it to fight people. You just need to:
- Kill Artorias (duh).
- Rescue Gough with the Crest Key.
- Ask his help with Kalameet, he will shot him down, and now Kalameet will be an "active" boss, a fog door will appear before entering his area.
- Now because Kalameet is an "active" boss, you can be invaded again in the Royal Forest, even though you already kill Artorias, you can also summon people.
- Just wait for the invader, give him a , and walk to the Artorias Arena.
- Do this:
- Enjoy your fight and if you win do this: