Sigil Bastion: Tower Defense

One tower. Endless enemies. Every ritual becomes a new build.

SIGIL BASTION is an idle incremental tower defense game. Your Arcane Bastion fights automatically — even offline — while you shape its power, run after run.

BUILD YOUR RITUAL
- Spend temporary Runes across Blade, Ward, Bargain, Pact, and Arcana.
- Control targeting priorities, game speed, automation, and enemy bans.
- Stack projectiles, critical hits, explosions, chain lightning, orbiting fireballs, familiars, and spells into your own tower defense build.
- Hunt rare enemies, Treasure carriers, Core enemies, bosses, splitters, and late-game mutations.

GROW BETWEEN RUNS
- Invest permanent resources into upgrades, Labs, Compression, Masteries, Density, and Torment.
- Take on randomized Challenge Realms and ascend into harder progression layers.
- Complete missions and achievements, dig into detailed stats, and collect idle offline earnings between sessions.
- Customize text size, contrast, effects, sound, frame rate, and notifications.

AN IDLE GAME THAT RESPECTS YOUR TIME
Play at your own pace. This incremental strategy game works fully offline, has no forced ads, and rewarded videos are always optional. Optional one-time Google Play purchases are available.