Booster Pack Heroes how to get mastery: quick guide

You earn Mastery simply by surviving runs — the official Booster Pack Heroes Steam page states plainly: "Survive to earn Mastery." There is no special condition to unlock it; every enemy killed during a run pays into it, and per one player reviewer, that payout happens "no matter what you pull," so even a run without strong heroes still feeds your Mastery total.

How Mastery is earned

The earning loop works like this:

1. Start a run

   Buy booster packs with the gold you get before each stage, then defend your tower against the monster horde.

2. Kill enemies

   Every enemy you kill earns Mastery, whether or not you survive the stage, according to the player review linked below.

3. Repeat

   Each run feeds the next: the official page stresses that "every run feeds the next, giving you more power and letting you survive a bit longer," so longer survival means a bigger Mastery payout over time.

Pushing deeper into a chapter and toward its boss is the practical way to increase your earnings, since surviving more waves means more kills before the run ends.

How to spend Mastery on the mastery tree

Mastery is spent between runs on the mastery tree, not during combat. According to the same player review of the game:

• Each unit can be upgraded several times, and the cost scales exponentially with each purchase.
• Every unit section does more than upgrade that unit — it also gives a global buff to every unit you have, which is why a weak early hero can turn strong after a few upgrades.
• The tree also carries tasks, and completing them raises the gold you get before each stage.
• The tree is not random: "the packs call the shots" inside a run, but "across the runs, the tree does."

The practical strategy players describe: even a bad run still pays into the tree, and every upgrade lowers the bar your next pulls have to clear. The official May 2026 patch notes also mention boss HP bar divisors added to help visualize mastery thresholds, so you can see how far you are from the next milestone when fighting bosses.

Next steps

• Booster Pack Heroes skill tree: a fuller breakdown of what the mastery tree holds and sensible purchase order.
• Booster Pack Heroes bosses: chapter bosses gate new packs and heroes, so knowing them helps you plan which Mastery upgrades matter first.

FAQ

Booster Pack Heroes how to get mastery — what exactly triggers it?

Killing enemies during runs. The official Steam page summarizes it as "Survive to earn Mastery," and a player reviewer confirms every kill earns Mastery regardless of what you pull from packs.

Do I lose Mastery if my run fails?

No. Per the player review, every kill pays into the tree no matter what you pull, so a failed run still earns Mastery toward upgrades.

Where do I spend Mastery?

Between runs, on the mastery tree. There you buy unit upgrades, global buffs, and task-related rewards like extra pre-stage gold.

Are Mastery upgrade costs fixed?

Per the player review, each unit can be upgraded several times and costs scale exponentially — repeated upgrades get progressively more expensive.

Checked 2026-11-08 against the official Steam store page and first-hand player footage (review video, demo gameplay). The exact mastery thresholds and per-upgrade costs come from player videos of the demo and remain unconfirmed for the full release.