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), the Feybreak expansion adds the Feybreak Tower (Bjorn and Bastigor), and Palworld 1.0 added the Tower of the Azure Covenant on Sunreach (Auri and Shaolong) — eight faction towers, all of them in the table below. There is a ninth tower boss, Zenara and Astralym at Lv 80, but it is not one of the faction towers: its arena is the Sealed Sanctum in the World Tree (our map lists that tower as Within the Seal), which is why it is absent from this list.
Each fight has a 5-minute time limit — Palworld 1.0 cut it from 10 minutes and adjusted boss stats to match. 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.