Booster Pack Heroes Bosses List and How to Beat Them

The Booster Pack Heroes bosses arrive at the end of each chapter, and players who beat the demo's toughest one say the decisive move is holding your Thunder spell until the boss appears rather than spending it on the regular waves. That is the single biggest habit difference between runs that die around the 30-second mark and runs that clear a chapter, per the player's own account.

The boss list you can fight today

The full game launches on November 10, 2026, so the only bosses currently playable are in the free demo. The demo has exactly three chapters, and each one ends in a boss fight. Bosses do not appear at the start of a chapter — you fight waves first, and the boss shows up only once you have survived long enough. In the playthrough, the chapter 1 boss arrived after roughly a minute of fighting, and the final demo boss appeared around the 1-minute mark of its chapter as well.

Winning a chapter boss is the core progression loop: the official Steam page states that defeating each chapter's boss unlocks new booster packs, heroes, spells, and challenges, and every run feeds the next one through Mastery. A developer patch note also confirms bosses have HP bars with divisors, added specifically to help you visualize mastery thresholds — useful for judging whether your damage output is close to a kill before the fight turns against you.

The demo's toughest boss is not named in the player footage, so treat the specific boss names and full-game boss roster as still unconfirmed until launch.

Strategy for defeating them, from the player who beat the toughest one

1. Save Thunder for the boss

   The player explicitly wasted Thunder early on a normal wave and regretted it ("I was supposed to use that later"). Thunder hits for a few seconds of heavy damage — spend it only when the boss or its second phase is on the field.

2. Build wave-clear first, burst second

   Early chapters reward cone-attack melee like the Barbarian, upgraded to widen its attack area, plus cheap ranged attackers. Low-range attackers outperformed melee-only builds in the player's test. Kill swarms before they clump — the player noted that grouped enemies become very hard to kill.

3. Keep the shop economy rolling

   Survive longer to earn more coins (good runs paid out 50–93 coins per attempt), then spend on pack-spawning buildings: the temple spawns a magic pack every 30 seconds with a 10% foil chance, and cheaper bag/shop upgrades spawn advanced packs on timers. More packs means more heroes and spells for the boss.

4. Buy survivability before the final chapter boss

   Two Witch Doctors were the player's deliberate purchase before the toughest fight, alongside the temple. Units die fast in boss fights, so healing support extends the window where your damage actually applies.

5. Assume a second phase — do not stop attacking

   The toughest boss fought back after what looked like a win. The player called this second phase the most dangerous thing in the run, worse than anything in Elden Ring's phase design by their own comparison. Keep spending damage and coins until the kill is fully confirmed, and if Thunder is still banked, that is the moment to use it.

• Thunder spell unspent before the boss appears
• Barbarian attack area upgraded, or ranged attackers in your lineup
• Temple or bag purchased so packs keep spawning during the fight
• Healing support (Witch Doctor) bought before the final chapter
• Coins in reserve for shop refreshes mid-fight

If a boss kill keeps failing, check whether you are spending Thunder on ordinary waves, whether your units are clumped where the boss's damage hits hardest, and whether your HP upgrades (the player pushed tower HP early) are keeping pace. These are conditional checks based on the playthrough's failure points, not tested game mechanics.

FAQ

How many bosses are in the demo?

Three — one boss at the end of each of the demo's three chapters. The full game launching November 10, 2026 adds more chapters across its realms, and its full boss roster is not yet confirmed.

Do the Booster Pack Heroes bosses have a second phase?

At least the demo's toughest one does. The player who beat it reports the fight appeared won after several stages, then a far more dangerous second phase began — so keep attacking and keep coins banked after the first apparent kill.

What do I get for defeating a chapter boss?

Per the official Steam page, each chapter boss unlocks new booster packs, heroes, spells, and challenges, and the run's earned Mastery carries into your next attempt.

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Check note: boss-per-chapter structure, unlock rewards, and the HP bar divisors come from the official Steam page, while the fight strategy, timing, and second-phase warning come from the player playthrough video. Boss names and the full-game boss roster remain unconfirmed until the November 10, 2026 launch.