He's a monster! He has four eyes!

So how does this work? I'm playing through Demon Souls now, and I'm still pretty early, but I'm far enough into world 2-1 that I think I'm starting to get hooked. I don't assume a ton of people are still playing, but how would it summon a player? And how does one go about being summoned? That would be an amazing…

Relic and THQ rocked the shit outta 40k. Worth every penny.