Board Thread:Dark Souls II/@comment-83.254.100.238-20140316105458/@comment-24684538-20140316144619

You don't get summoned to their world, they're dragged into your world. Each time you kill a trespasser (or gray phantom) you'll get a rat tail and a pharros lockstone, the ranks go like this;

Rank 0 - Join

Rank 1 - 10 Rat Tails, you get 10 small smooth and silky stones

Rank 2 - 20 Rat Tails, you get 10 smooth and silky stones

Rank 3 - 30-35 Rat Tails (I wasn't paying attention so I lost track but its withing this range), you get Slumbering Dragoncrest Ring