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Underground Security Inc DemoEventsNarrative Update + Hero Ability Rework for new Demo Patch
In-game event

Narrative Update + Hero Ability Rework for new Demo Patch

Underground Security Inc Demo · published 10 Jun 2026, 04:09 UTC

All eventsPlayers around this dateRead on Steam

Narrative and Player Tips

The full-release is planned to include a meta-narrative that spans across runs and explores some of the relationships between the different bosses as well as the history of the Shareholders and its company. Much of this will be explored through short pre-combat dialog scenes that will progress the story as the player faces each boss over multiple runs.

The demo now includes some narrative events for the demo bosses.

This system is also utilized to help provide useful tips to players during their first few runs, explaining concepts not covered by the tutorial like hero pathing and building movement.

Gameplay Changes:

  • New Minion Headquarters Building. This is a special building which starts in the dungeon after the player has unlocked the Yorick's Skull Memento. The Minion Headquarters can be upgraded to increase the draw size of the player as well as how many minions can be held in hand at the end of each night.

  • Hero ability rework. Some hero abilities have been reworked to create more cohesive enemy designs. Previously, a high-level hero is spawned with a random set of hero Items specific to their class. Now, most of the high-level heroes spawn with a single class-specific item that scales based on their level. In addition, more of the hero abilities synergize with the number of heroes in the party, making larger parties in later encounters more challenging.

  • New Entrance Spawn. The entrance spawning logic has been changed so that instead of spawning from the dungeon chest, new entrances spawn from a combination of existing chambers and existing entrances, leading to a tighter map and allowing players to utilize some of their existing defenses for the new waves.

  • Tutorial Pacing: the tutorial option has been removed from the main menu. Players launching the demo will automatically be dropped into the tutorial for their first game. In addition, the Yorick's Skull and Weird Cauldron mementos are unlocked after a player completes two runs.

  • Added an option for players to reset their game files.

Balance Changes

  • Veteran and Heroic difficulty includes increased health scaling for heroes with each infamy level. This should make these difficulty levels more challenging for experienced players.

  • Mastermind's Grand Plan ability limited to 5 other buildings.

  • Slimes no longer have fragile and the budding ability has been changed to add a temporary copy of the slime when drawn .

  • "The Gem of Intellect" tool upgrade has been split into four separate tools: each one converting either build, mine, upgrade or channel of a single minion into wild skills.

  • Soul of Ice spell buffed with increased stun duration.

  • The Chest can now be moved like other buildings.

  • Mary of Nijmegen Tome reduced maximum burn stacks applied from 10 to 5.

  • Rangers spawn with Cloak of Feathers: which applies hidden to nearby heroes after taking damage. Cooldown scaling with the level of the ranger.

Bug Fixes:

  • Fixed bug report url

  • Fixed issue where sometimes minions can spawn in the same location as a entrance pillar and not participate in combat

  • Fixed graphical issue with traps that replace the dungeon floor

More from Underground Security Inc Demo

Other announcements

All events
Underground Security IGame update11 Sep 2026Demo Patch v0.4.20Quick hotfix to the demo fixing a bug with the Shadow Mage where the dark synergy was trigger on assign and past the normal 3 ability cap.Underground Security IGame update22 Aug 2026Demo Patch v0.4.24A quick update to the demo to fix a few bugs · Modified the logic for Tomida Femina so that it no longer tries to draw past your hand size · Fixed a bug where Book of Riches Volume 3 does not trigger · Fixed an issue where restarting the day while in a tutorial screen disables tooltips temporarilyUnderground Security IGame update10 Aug 2026Demo Patch v0.4.23Demo patch fixing some bug fixes: · Fixed a bug where minions could be dragged from the crypt and deck could allow the minion to be deployed or assigned into the dungeon · Fixed an issue, where opening the settings menu on controller can lead to a soft-lock while in the tutorial