Boss Towers gate progression in Palworld. The five base-game towers belong to the Rayne Syndicate (Zoe and Grizzbolt), Free Pal Alliance (Lily and Lyleen), Brothers of the Eternal Pyre (Axel and Orserk), PIDF (Marcus and Faleris), and PAL Genetic Research Unit (Victor and Shadowbeak). The Sakurajima expansion adds the Moonflower Tower (Saya and Selyne) and the Feybreak expansion adds the Feybreak Tower (Bjorn and Bastigor) — seven faction towers across Palpagos and the expansion islands. Palworld 1.0 added further tower bosses on Sunreach, the new sky-island region, which are not yet mapped here.
Each fight has a 10-minute time limit. The tower entrance is its own fast-travel point — unlock it on approach so you can respawn at the door if you wipe inside.
Source: palworld.wiki.gg/wiki/Tower.