Armies Against Entropy

This is Armies Against Entropy, a cooperative trading card game where you and a friend face the relentless onslaught of the old gods and their monstrous hordes. Choose your god, expand your domain, build mighty structures, and rally great heroes to defend this world you call home. Stand together, fight back, and strike down the Old Gods before they unmake all of existence.

Play AAE ▶ How to play

Start here

How to play

Watch more devlogs 4 videos →

The rulebook

Read the rules

Every rule, fully illustrated. Flip through rulebook v1.1.7 here, and look for Try it to test a rule for yourself.

New to the game? Quick Start Guide, 2 pages →

Pages 1 and 2 of 15

Download the PDF 14 MB

Try it · rulebook page 2

Read a player card

Click part of a real card, or pick it from the list, to see what it means. Then test yourself.

Lone Dark-Arts Necromancer

Try it · rulebook page 4

Read an Old God card

Click part of an Old God card, or pick it from the list, to see what it means. Then test yourself.

Null Sanctum

Try it · rulebook page 10

Try an attack

When you attack an Old God card, your card loses units equal to the target’s strength, and partial damage doesn’t weaken it, so bring enough.

Osgathian Warrior
5 units

Set your units, then attack.

Brinecross Slicer

Monster · strength 4

Every round

How a round goes

At the start of each round, you decide together who goes first. After every player has taken a turn, the Old God takes its turn, and it repeats until the game is won or lost. Pick a step to read it in the rulebook.

Each player’s turn

Then the Old God

  1. Draw

    Draw two cards.

  2. Play

    Play two cards: any mix of Heroes, Lands and Structures. Spells can be played at any time.

  3. Units

    Your cards gain their units, then you move units between them.

  4. Attack

    Every card with the attack icon can attack once.

  5. Draw

    The Old God’s card-draw cards bring new threats into play.

  6. Attack

    Monsters and minions attack in the order they were played, left to right.

↺ Then the next round begins.

The table

Two sides, one board

Your goal is to work together with a friend to defeat the Old God. Pick a zone to see what goes there.

The Armies Against Entropy play space
Browse all 172 cards →

In the rulebook, page 3 →

Before you play

Pick your fight

It’s co-op. Each player chooses a God to lead their army, and together you face one Old God. Old Gods vary in difficulty: for a first game, start with Boagtet, God of Rot.

Your team

The Old God

Player one’s god

Abrial, Goddess of Creation

All Structure with an ability may activate for free when placed.

Triggered Effect: When a Card is played: Place 1 additional unit on that Card.

Play this matchup ↓

Ready to play?

Ways to play

No matter your preferred play style, there’s an option for everyone.

Most polished

Tabletop Simulator

Tabletop Simulator is a game that can be bought on Steam for around $20. Once you have bought the game, you can play Armies Against Entropy by installing the mod.

Install the mod on Steam → Read the rulebook
  • Free

    Screentop.gg

    If you prefer a free option, you can use screentop.gg. It has a little less functionality, but it works relatively the same. All you have to do is get an account.

    Play on screentop.gg →
  • Free

    Print and play

    If you would prefer to play the old-fashioned way, you can print out the cards and play with them that way. Here are a few different versions:

  • Coming soon

    Play in your browser

    A digital version that runs right here, with no install and no account. Still being built.

    Coming soon

If you would like to play with even more features, you can join my Patreon and play the beta.

Still growing

Patch notes

October 8, 2026

v1.2.0 AAE Patch Notes

Seventeen new cards for the Old God decks: 2 new Minions, 6 new Monsters, 5 new Ruins, 2 new Wastelands and 2 new Curses.

 June 9, 2026

v1.1.9 AAE Patch Notes

This update is focusing on the old gods themselves and deck building around them, making more changes for the players and varied difficulties for the game. This will act as a balance to counteract player deck building…

 April 26, 2026

v1.1.8 AAE Patch Notes

Here is the balancing patch after a few playtests of some of the new decks. Keep in mind not all decks have been playtested yet and will require further balancing. I’m trying to get these out more often to expect more…
All 11 patch notes →
Beets holding a heart

Thank you for playing!

Questions, feedback, or looking for people to play with? Join the Discord.