Board Thread:Dark Souls II/@comment-79.103.126.41-20151209153744/@comment-4511886-20151209160701

They have limited respawns. However, I believe you can enter the Company of Champions to make them respawn infinitely. You have to reach the maximum rank with the Pilgrims of Dark before you can enter the Chasms while part of another covenant, which means defeating Darklurker is a must.