Boss packs are a mechanic in slender fortress that contain an amount of 2 - 25 bosses. Boss packs were introduced becasue of lag and problems that occured on the server. Boss packs can be picked after joining a map so you can choose what boss pack will be active when you go to the next map, this also counts for core boss maps because if a Roullete round is present on the map there is a possibility that it will spawn a random boss in the core boss maps.
Boss Packs (A-Z)[]
Half Life pack