After defeating Pyromaniac in The First Descendant, the next boss you'll have to fight is Swamp Walker. It's not nearly as challenging as Pyromaniac, but there are a few things you should know going into the Swamp Walker Void Intercept Battle.
How to Kill SWAMP WALKER EASY The First Descendant – Tips and Tricks, How to Prepare for a Boss Fight
Swamp Walker appears twice in The First Descendant, first as a level 82 Normal boss, and then as a level 118 Hard boss. The boss's design and mechanics are very similar to the Grave Walker, the very first boss in the game.
Target the following weak spots to inflict the most damage:
The boss's attacks consist of missiles, minigun attacks, and monster spawning. In frenzied state, you must destroy the vials on Swamp Walker's legs. Try to avoid leading the boss to the edge of the map, as one of the vials might land on its back. During this state, the boss also becomes more aggressive and fires more missiles.