After Inc Halloween Horde is a seasonal mini-campaign in After Inc: Revival, added by Update 15, and it runs from October 16 to November 8, 2026. It contains three supernatural missions called Haunting Hallow, Trick or Treat and Blood Moon. The update also adds a new Halloween decision and new bubbles that ask you to roll the dice on a spooky offer. However, the developers have not published mission goals or reward lists, so treat any detailed walkthrough you see as unverified.
Summary: After Inc Halloween Horde
- Dates: October 16 to November 8, 2026.
- Update: Update 15 of After Inc: Revival.
- Missions: Haunting Hallow, Trick or Treat and Blood Moon.
- New content: a Halloween decision and Trick or Treat bubbles.
- Platform: Steam, where the game costs $17.99. It is also Steam Deck Verified.
- Not published: mission goals, rewards and mission-specific rules.
What Halloween Horde Is
After Inc: Revival comes from Ndemic Creations, the studio behind Plague Inc. It mixes survival city building with light strategy, and you lead survivors who rebuild after a zombie apocalypse. The game left Early Access with its 1.0 release on August 11, 2026, and the studio gave every player the Season 2 DLC for free at that point.
Halloween Horde is a limited-time mini-campaign. The official Update 15 post describes it this way: spirits are awakening, survivors rush into a strange new harvest, and a treat may turn into a fatal trick. In plain terms, it is a themed set of three levels, and you manage a settlement and complete goals in each, as you do in the main campaigns.
The official wiki lists the three levels:
| Mission | Notes |
|---|---|
| Haunting Hallow | First mission of the mini-campaign |
| Trick or Treat | Second mission, which shares its name with the new bubbles |
| Blood Moon | Final mission |
The order above follows the wiki’s list. The wiki does not confirm whether you must play them in sequence, so check your level select screen.
Halloween Horde Event Dates
Here is how the schedule looks:
| Detail | Date |
|---|---|
| Event start | October 16, 2026 |
| Event end | November 8, 2026 |
| Length | About three weeks |
The studio has not announced a start hour. So, if you want to play on day one, check your game for the new mini-campaign and update it through Steam first. The developers also say the event is time-limited, which suggests you should finish the missions before November 8, but they do not state what happens to your progress afterward.
For another example of a seasonal event with a clear end date, see our Dinkum Spooky Event guide.
Trick or Treat Bubbles and the Halloween Decision
Update 15 adds two small features that go with the mini-campaign:
- New bubbles. The patch note says it is time to roll the dice, and it asks whether the spirits will tempt you.
- A new Halloween decision. The changelog lists it as a new feature.
To understand them, remember how After Inc handles events. The game shows bubbles above your settlement, such as Celebration bubbles, Leader bubbles and the New Population bubble. Each one asks you to react or decide. A Trick or Treat bubble follows the same pattern, but the name suggests a gamble with a good or bad result.
The developers have not published the possible outcomes. As a result, I cannot tell you which choice is safest. Treat each bubble as a risk, and avoid taking it when your settlement is already struggling.
Update 15 Patch Notes
The official Update 15 changelog is short:
| Type | Change |
|---|---|
| New feature | New mini-campaign: Halloween Horde, playable October 16 to November 8 |
| New feature | New Halloween decision |
Nothing else appears in the Update 15 post. That makes it a content-only update, not a balance patch.
The same Steam post also previews a follow-up. The studio says some players felt a graphs update was not exciting enough for a full update, but it plans one anyway. The preview lists these changes:
- Improved Resource, Morale and Authority graph visuals that show stockpiles, storage limits and seasonal changes.
- A frost vignette during Winter.
- A timer on the New Population bubble.
- A lower maximum difficulty for Extra Expeditions.
- Less frequent Society Variety rewards.
That list is labeled as what comes next, so it is not part of Update 15 itself.
After Inc Revival Seasonal Events and Rewards
Halloween Horde is one of several seasonal updates. The Steam news list shows earlier ones:
| Update | Event |
|---|---|
| Update 10 | Valentine’s Fever mini-campaign |
| Update 11 | Easter Trail and Into the Unknown |
| Update 15 | Halloween Horde mini-campaign |
The studio says it ran 12 major updates during Early Access, and seasonal events were among them. Meanwhile, the base game offers over 700 cross-level rewards and 700 more expedition rewards added at 1.0, according to the studio’s own notes.
However, no source I found lists specific Halloween Horde rewards. Therefore, play the missions for the content and check your rewards screen afterward.
Settlement Tips for Halloween Horde
These tips come from official systems in earlier patch notes. They are not tested Halloween Horde strategies, so use them as a starting plan:
- Watch zombie awareness. Update 5 added a mechanic where claiming, fighter movement, settlement activity and weather raise zombie awareness. Higher awareness wakes zombies more easily and makes them join fights faster.
- Keep morale above 100% when you can. Update 5 gives you a chance of Celebration bubbles when morale exceeds 100%, capped by your population.
- Taunt carefully. Fighters prepare for battle while taunting, and that boosts their strength.
- Move quietly near zombies. Fighters try to be quiet and move slower, so they rarely wake a group on first contact.
- Read the timer on population bubbles. The upcoming update adds a timer, so decide before it runs out.
One caution applies. The event has a Blood Moon level, and the studio has not explained its rules. So scout your first minutes carefully before you commit resources.
What We Still Do Not Know
| Question | Status |
|---|---|
| Mission goals | Not published |
| Reward list | Not published |
| Trick or Treat bubble outcomes | Not published |
| Event start hour | Not published |
| Progress after November 8 | Not published |
Common Mistakes
- Missing the end date. The event ends November 8.
- Trusting unofficial walkthroughs. No official mission guide exists yet.
- Taking every bubble. Trick or Treat bubbles are gambles.
- Forgetting to update. The mini-campaign arrives through Update 15.
- Mixing up updates. The graph changes belong to the next update, not Update 15.
Conclusion
After Inc Halloween Horde gives you three limited-time missions and a few new Halloween features until November 8. Play it soon, treat the new bubbles with care, and lean on the settlement basics from earlier updates. Everything here is accurate as of October 16, 2026, and Ndemic Creations may add details or patches during the event.
FAQs
When does the After Inc Halloween Horde event start and end?
It runs from October 16 to November 8, 2026.
How many missions are in Halloween Horde?
There are three: Haunting Hallow, Trick or Treat and Blood Moon.
What does Update 15 add to After Inc: Revival?
It adds the Halloween Horde mini-campaign and a new Halloween decision. The post also teases new bubbles.
Are there rewards for finishing Halloween Horde?
The developers have not published a reward list.
How much is After Inc: Revival?
The Steam listing shows $17.99.
Is After Inc: Revival Steam Deck compatible?
Yes. It is Steam Deck Verified.
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