Thrombus and Keeping it real: Finish the main story. Stark Raving mad: See following post! Yes I bet you have: The Wretched Hive quest can be started in Frisktorp. Wind Breaker: Roger and his pet can be found and killed in the medium co-op mission. We are the freaks and I am so electrified: Cortex and ElectroBert can be found and killed in the hard co-op mission. I scratched the surface: Limbo can be found next to Solside City. Descending to level 45 is everything but an easy task. Be sure to bring a lot of patience and money with you! The threat levels as follows: 10 - Limbo, level 1-8 11 - Limbo, level 9-20 12 - Limbo, level 21-28 13 - Limbo, level 29-36 14 - Limbo, level 37-40 15 - Limbo, level 41-?