This happens after you defeat the Bell Eater boss, which is quite a challenge because it limits your movement a lot. How To Reach Bell EaterBell Eater is one of the few bosses in Silksong that you can’t miss. This action will cause the Bell Eater to spawn, and you’ll need to go underground to start the fight. The biggest challenge in this fight is doing enough damage because the boss parts don’t stay on the field after attacking. After defeating the Bell Eater, you unlock the Beastling Call Needolin music.