If you’ve spent any time running PvE missions in The First Descendant, you’ve almost certainly hit the wall that is the Pyromaniac boss fight. I spent three straight attempts getting one-shot by his flame waves and arena-wide burn attacks before I figured out the patterns and loadout tweaks that turn this frustrating fight into a trivial clear. This guide breaks down everything you need to know to beat the Pyromaniac First Descendant, no overgeared squad or premium skins required.
How to Beat the Pyromaniac First Descendant: Pre-Fight Loadout Prep
Most players wipe to this boss before they even fire their first shot, because they show up with the wrong gear. The first and most non-negotiable tweak to your loadout is fire resistance. Stack at least 70% fire resistance on your armor modules before you load into the mission. This cuts all burn damage by 60%, which eliminates the biggest cause of deaths in the fight. Even if you have to drop a small damage boost to hit that resistance threshold, it’s 100% worth it.
Next, pick the right weapons for the job. You don’t want to show up with fire elemental weapons, obviously—he’s completely immune to fire damage, so you’ll waste entire mags doing zero damage to his shield or health bar. Prioritize cryo or toxic elemental weapons for this fight. Cryo slows his movement and attack speed by 30% when you build up enough stacks, which makes his fast attacks way easier to dodge. Toxic damage ticks through his flame shield even when he’s in defensive mode, so you can keep chipping away at his health even when you can’t land direct hits on weak points.
For your ability modules, bring a mobility option like double jump or extended dash if you have it. You’ll be dodging a lot of wide, fast attacks, and the extra mobility will get you out of tight spots faster than a shield booster will. If you’re playing solo, swap your standard shield booster for a heal over time module. Burn damage bypasses most shields 80% of the time, so you’ll get far more use out of consistent health regen than you will a temporary shield buffer.
Pyromaniac Attack Patterns You Need to Memorize
Wipes in this fight almost never happen because you’re undergeared. They happen because you don’t recognize the boss’s tells before he launches a high-damage attack. Every attack has a clear, half-second to one-second tell you can spot if you’re paying attention, and learning these will let you dodge almost every hit in the fight.
The most common attack you’ll face is the triple flame wave. He slams his fist on the ground three times in a row, each time sending a wide horizontal wave of fire across the arena that deals 40% of your max health as damage if it hits. Gaps between the waves are narrow, but you can slip through them or jump over them if you have double jump. The arena burn phase is the attack that wipes most squads. He raises both arms in the air and roars, and after three seconds the entire floor is covered in fire that deals 15% of your health per second for 10 seconds. The only safe spots are the four raised concrete platforms at each corner of the arena.
- Triple flame wave tell: Fist pulled back over his shoulder, left foot planted firmly on the ground
- Arena burn tell: Both arms raised fully above his head, orange glow building around his body
- Charge attack tell: Upper body leans back 30 degrees, hands clenched into fists at his sides
- Flame shield tell: He crosses his arms in front of his chest, fire swirling around his torso
The charge attack is the most punishing attack for solo players. He leans back then sprints directly at the closest player, grabbing them and dealing 90% of their max health as damage plus a 5 second burn effect. If you see him lean back, dodge sideways immediately—don’t try to run straight away, he’s faster than every base movement speed in the game. Don't wait for the roar to end to run to a platform when you see the arena burn tell. Start moving as soon as his arms go up, even if you’re in the middle of a big damage burst. A half second delay is all it takes to get stuck in the fire before you can reach safety.
Optimal Damage Rotation for Solo and Squad Play
Once you have his attack patterns down, you can start focusing on dealing damage efficiently. The Pyromaniac has a flame shield that reduces all incoming damage by 70% until you break it, so your first priority in every phase is to take that shield down as fast as possible. The weak point for shield breaks is the glowing orange chest plate he wears. Hit that spot repeatedly with your cryo weapon, and the shield will shatter in 5 to 7 hits for most mid-game builds.
When the shield breaks, he enters a staggered state for 15 seconds where he takes 2x damage from all sources, and his head becomes a critical hit spot that takes an extra 3x damage. This is the only time you should use your ultimate ability or any damage boosting consumables. Swap to your highest DPS primary weapon, unload on his head, and you can knock off 30 to 40% of his total health bar in that single staggered window. If you’re playing solo, you only need to break his shield 3 times to finish the fight, as long as you land your critical hits during the stagger phase.
For squad play, assign roles before you start the fight to avoid chaos. One player can focus entirely on applying cryo stacks to slow the boss down, another can run distraction to draw his charge attacks away from your DPS players, and the remaining two can focus entirely on breaking the shield and dealing burst damage during stagger windows. Always call out when you see the arena burn tell in squad play, because not everyone might be facing the boss at the same time, and a single late call can lead to multiple players getting caught in the fire. Don’t all stand on the same platform during the burn phase either—he will sometimes throw a fire bomb at clustered players that can knock everyone off into the fire below.
Common Mistakes That Make This Fight Way Harder Than It Needs to Be
Even if you have the right loadout and know all the attack patterns, small mistakes can turn an easy clear into a frustrating wipe. The most common mistake I see is players bringing fire elemental weapons to the fight. I’ve joined random squads where half the team was running fire SMGs or rifles, and we barely scratched his shield before our respawns ran out. If you’re not sure what element to bring, just default to cryo—it works for every phase of the fight, no exceptions.
Another common mistake is staying too close to the boss for the entire fight. His melee attacks have a much wider range than most players expect, and they deal 60% of your max health as damage plus a burn effect. Stay at least 10 meters away unless you’re using a shotgun for burst damage right after the shield breaks, and even then, back up as soon as the stagger window ends. Wasting healing items on small burn ticks is another mistake that leads to unnecessary deaths. If you have 70% fire resistance, small burn ticks only do 5 to 10 damage per second, so you can save your heal items for when you get hit by a charge attack or a flame wave.
Never use a heal item when you're standing in fire, the burn will just eat back through the health you just regained almost instantly. I once wiped a full squad because I tried to revive a teammate right as the arena burn kicked in, so trust me when I say that’s a mistake you don’t want to make. Wait until the fire clears completely to revive downed teammates, even if they’re begging for a pick-up. It’s better to lose one player for a phase than to lose two players and burn through your respawns for no reason.
You don’t need top-tier gear or a full squad of max level players to get through this fight. Once you memorize his attack patterns, get your fire resistance stacked, and focus your damage on the right weak points at the right time, you’ll clear it consistently every time. Next time you load into the mission, you’ll be ready to beat the Pyromaniac First Descendant without wasting half your respawns on avoidable mistakes. If you have your own tips that worked for you, drop them in the comments below to help other players out.