A full wiki page for this entity is still being generated. Until then, see the recorded facts below.
Sources — 6 recorded facts, by chapter
Chapter 14
- The first borough boss defeated required a group of ten well-armed crawlers, who each earned Silver Boss Boxes and Platinum Weapons Boxes containing magic tomes and enchanted ranged weapons.
- The post-episode announcement reported 15 borough bosses taken out so far.
Chapter 21
- A massive, fast, pink and fleshy ball-shaped creature reeking of sewage circles a round spiral maze near the floor-two stairwell, identified by graffiti as a 'borough boss' that is activated by going deeper into the spiral.
- Its presence contradicts Mordecai's claim that bosses wouldn't guard stairwells until the fourth floor.
Chapter 22
- An unidentified borough boss patrols the spiral maze, speeding past fast enough to shake the walls, and is considered nearly impossible to kill; a recap showed one such boss slaughtering forty crawlers.
Chapter 30
- The borough boss is the second-weakest type of boss; surviving its chamber places a crawler in the top 5% of all crawlers.