Booster Pack Heroes Portal: How It Works and Fills Up

The Booster Pack Heroes portal spawns allies from your collection automatically, and it only produces units once it has filled up — you cannot hit or activate it early. In the demo, one streamer clicked the portal expecting units and got nothing, then realized "it has to fill up" before anything spawned. Once charged, it releases allies pulled from the heroes you have unlocked, which makes it a free unit source alongside your pack openings. Booster Pack Heroes is an incremental tower-survival game from developer zup and publisher Funday Games, listed on the official Steam store page.

What the portal does and how it fills

The portal sits on the battlefield next to your tower and needs no player input. When its charge completes, allies from your collection walk out and fight on their own. In the demo footage, spawned illusionists produced noticeable lightning damage — spawned allies appeared to benefit from illusionist behavior such as casting Thunderbolts, though exactly which abilities carry over depends on what is in your collection. Treat the portal as a passive reinforcement timer: the more time it runs undamaged, the more free allies it delivers during a wave.

Two things shape how effective it is:

• A mastery upgrade makes portals activate more frequently. Spending points here shortens the wait between spawns, which is why players pick it up once it appears on the tree.
• Enemies can kill the portal. In the demo, boss minions destroyed the portal before it could fire, costing the whole charge. Keep units between monsters and the portal, and use stuns or AoE clears to peel enemies off it.

Using the portal effectively

Because its output scales with your collection, the portal gets better the longer you play. A build that stacks many illusionists turns the portal into a lightning engine, since the allies it spawns join your existing units in overwhelming the screen. During boss phases with adds, let the portal handle spawns while your placed units focus the boss.

If the portal seems inactive, check that its charge bar is actually full and that no enemies are attacking it — those are the two reasons a player saw it "not spawning anything" in the demo.

Next steps

• Follow the beginner guide to set up your gold economy so you can afford the mastery nodes that speed up portals.
• The skill tree page helps you plan which upgrades — including portal frequency — to prioritize.

FAQ

Does the Booster Pack Heroes portal need to be clicked to work?

No. In the demo, clicking it did nothing; it fills up on its own and spawns allies automatically once charged.

Can enemies destroy the portal?

Yes. Demo footage shows boss-phase minions killing the portal before it released its allies, so defending it is part of using it well.

What comes out of the portal?

Allies drawn from your collection. With an illusionist-heavy collection, spawned units produced heavy lightning damage in the demo.

How do I make the portal spawn more often?

Players report a mastery upgrade that makes portals activate more frequently; investing points there shortens the cycle between spawns.

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Page checked on 2026-11-08 against the official Steam store page and the developer's Steam announcements, plus first-hand demo footage from the YouTube playthrough "This Pack Opening Incremental Game Is Actually Fun." The portal's fill rate, exact ally-pool rules, and whether the Thunderbolt behavior from spawned illusionists is intended remain unconfirmed by the developer.