Monster Train 2 Adds Free Lost Arsenal Update

In May, I spent dozens of hours with Monster Train 2 and came away calling it the perfect sequel in my review. It expands on the original’s addictive, tactical deck-building core by adding new clans and plenty of quality-of-life improvements. Now, developer Shiny Shoe is building on that foundation with the game’s first free update, Lost Arsenal. Along with new cards for every clan, Lost Arsenal adds new clanless equipment, new room cards, and a list of balance changes to existing cards.

While it’s best to explore what’s new on your own in the game, there are some cards worth highlighting to get you excited. Echo Vault is one of the new rooms: “At the end of the turn, the last spell played on this floor is played again.” One of the new clanless equipment cards adds Sweep and sets a unit’s attack to 30, but that value cannot be changed afterward.

Other new features in Lost Arsenal include a new Titan Cup that tracks the win streak for Titan victories at Covenant 10, as well as a new Titan Trial Default option in gameplay settings that automatically enables all Titan Trials. You can see a list of the changes below, but it’s not the full list due to spoilers.

In addition to the release of Lost Arsenal, Monster Train 2 now offers a Deluxe Edition, which includes the base game at a 10 percent discount and a digital copy of Monster Train 2’s soundtrack and compendium. The team also shared a content roadmap, with the second free update arriving sometime in Q4 2025. That update will add new bosses, challenges, artifacts, and train room cosmetics. The third free update is currently scheduled for release in Q1 2026, but its content is under wraps. Monster Train 2 will also get paid DLC early next year that adds a new game mode, a new clan, and more.

Monster Train 2 Lost Arsenal Spoiler-Free Patch Notes

Other New Features & Quality of Life

1. Added “Titan Trial Default” option to gameplay settings to optionally automatically enable all Titan Trials. Added a tutorial to explain this.
2. Added new Titan Cup that tracks the win streak for Titan victories at Covenant 10.
3. When using controller or keyboard controls, added ability to move room targeted cards around so you can move it out of the way if it is blocking something. Added a tutorial to explain this functionality.
4. Made it so the battle intro screen enemy unit stats take into account mutators and other gameplay effects beyond Covenant levels.
5. Added visual UI difference in Dragon’s Hoard to differentiate rewards with one artifact from an artifact draft.
6. Added a copy sharecode button that copies it to the clipboard when playing on PC desktop.

Banished Changes

1. Penitent’s Bloodsuit cost reduced from 1 >>> 0.
2. Spike of the Banished increased from 3X >>> 4X Valor.
3. Fixed various behavior and communication bugs related to the interaction of Celestial Cascade and Fel’s Unchained upgrade path.
4. Fixed ‘Wyngh’s Radiance’ not fully showing effects of Doublestack upgrade on card text.
5. Fixed keyboard/controller Flight ability target selection glitch when room is at max unit capacity.

Pyreborne Changes

1. Miser stats updated from 3/9 >>> 8/8.
2. Gilded Egg and the variants can now attack if given an attack bonus.
3. Fixed Pyreborne’s Insignia persisting until the end of battle instead of unit death.
4. Fixed ‘Pay Off’ spells rigged with Holystone upgrades incorrectly scaling the amount of bonus Pyre healing.
5. Pyreblooded cost reduced from 2 >>> 1.
6. Devilish Details pyre damage decreased from 10 >>> 8.

Luna Coven Changes

1. Fixed Scrivener ability Spellweave cost reduction not stacking.
2. Nightingale updated “New Moon: Multistrike 1 >>> 2.”
3. Silver Empress stats updated from 15/10, 20/15, 30/20 >>> 20/20, 25/25, 30/30. Silver Empress I conduit increased from 15 >>> 20.
4. Hexscalation cost reduced from 2 >>> 1.
5. Updated Hierophant Arduhn. “Silent units gain double armor” >>> “Silent units gain +1/2/3 ATK.”
6. Fixed spells copied when units with Conduit are present incorrectly doubling the Conduit bonus.

Underlegion Changes

1. Sporesinger Madame Lionsmane III updated “When a unit gains Decay, it gains +4 >>> +5 stacks.”
2. Underlegion Mossystone now additionally grants +10 HP on top of the existing 10 Regen.
3. Headsman III ATK increased from 100 >>> 160.
4. Executioner Bolete upgrade line updated from: “Harvest: Gain Regen 2/3/5 and Rage 2/3/5.” >>> “Siphon: Spawn 2/2/3. Troop adds +1/2/3 HP per stack.” Stats updated from 10/30, 30/60, 50/120 >>> 30/20, 50/50, 80/100.
5. Fixed bug where Evolutionary Instinct would count hidden statuses that drive abilities and some equipment.
6. Fixed bug where Evolutionary Instinct might trigger multiple times when adding statuses, especially on spawn.
7. Fixed an issue with Funguy incorrectly resetting equipment cooldowns when adding Troop stacks.

Lazarus League Changes

1. Pincushion stats increased from 6/6 >>> 12/12.
2. Organ Harvester ember cost increased 1 >>> 2.
3. Increased the cost of Test Subject Alpha from 2 to 3.
4. It’s Alive ATK decreased from +10 >>> +7.
5. Baron Grael Learning Limb stats updated from 15/25, 30/40, 60/60 >>> 10/25, 20/45, 40/80. Permanent ATK granted to equipment increased from 2/4/6 >>> 3/6/9.
6. Baron Grael It Hungers HP reduced from 25/45/85 >>> 20/40/80.

Clanless Changes

1. Savage Spirit now grants 40 HP.
2. Wyngh’s Spirit HP increased from 70 >>> 75.
3. Heart of the Pact Pyre Heart HP increased from 55 >>> 65.
4. Made Pyre Heart Savagery upgrade “unique” so it isn’t copied by Fecundity.
5. Freezestone now grants -1 cost.
6. Benevolence ability updated from “Restore friendly units to full health” >>> “Restore friendly units to full health and grant +5 Max HP.”
7. Changed Enchant effects to use blue style ‘state’ display icons.
8. Fixed Triboulet artifact incorrectly removing health from purged Ephemeral cards.
9. Updated flavor text order in TitanEntropy event to match the order of the choices.
10. Fixed bug where Curse of Forgetfulness could trigger from unit abilities.
11. Changed Fecundity upgrade behavior so that the card copy mechanic only happens once. It had to be done.
12. Fixed ‘Emot Tome’ incorrectly copying cost bonus from ‘Ancient Roots’ onto its Ephemeral duplicate card.

General Bug Fixes & Text Clarification

1. Fixed exploit where cards that reduce a unit’s Max HP could be used on the Titan fight to kill an individual Titan without the others being at 1 HP.
2. Fixed bug where various persistent effects granted by equipment/rooms/enchantments would be stripped off a unit upon removal of those things even if the unit had those effects previously already because it was provided by spells or was innate. Some examples: Trample, Quick, Silence, etc.
3. Changed equipment merging to no longer allow two pieces of equipment with abilities to be merged.
4. Updated Clan selection dialog to properly highlight currently selected Clan and Pyre Heart.
5. Updated hitbox of trial and start battle buttons in battle intro screen to reduce the likelihood of misclicks.
6. Fixed keyboard A/D key binds not navigating left/right.
7. Updated Mute and Silence tooltips to specify they will block “Enchants” from applying as well.
8. Fixed Heavenfall card saying “Russian>><<” in the middle of the card in that language (and others).
9. Fixed room navigation tooltip not showing up when you switch from mouse to keyboard.
10. Win streaks now have tooltips in the run summary screen.
11. Fixed rewards and cards from drawing over the deck screen during events.
12. Fixed sometimes clicking on a unit ability putting the game in a bad state.
13. Fixed bug where Slay triggers would not always happen if the unit with the trigger died or was reanimated simultaneously.
14. Fixed issue where a unit in Stasis could take damage from statuses if they were given to the unit before entering Stasis.
15. Fixed ‘Vola’s Tuning Fork’ bonus being incorrectly duplicated by artifacts that copy cards.
16. Fixed Graft + Jack in the Box interaction if the box gets duplicated or upgraded with Endless.
17. Fixed bug where Loamcoat’s Propagate was impacted by Dualism.
18. Fixed not being able to generate a Community Challenge from a custom run.
19. Fixed clicking on ability and activating other unit’s ability under certain conditions.
20. Fixed quitting while card draft open and resuming showing different cards.
21. Fixed battle messages (e.g. “Hand full”) sometimes coming up at the end of continue or undo.
22. Fixed units with Endless going to the Consume pile when killed on the same turn as a Cardless unit.
23. Added tutorial that appears when replacing an ability on a unit to explain that a unit can only have one ability.
24. Fixed wrong enemies shown in pre-battle screen on Quicksilver Cherubs (2), Penance Seekers (4), and Corrupted Crusade (5).
25. Fixed soft lock if no units in deck, and winning large wing in Clipped Wings story event.
26. Fixed soft lock when no movement keys are bound and card movement tutorials are displayed.
27. Added capacity tooltips to cards that were missing it.
28. Made some under the hood changes to reduce memory leaks.
29. Improved English text consistency on a variety of content.
30. Integrated various translation improvements into Russian, Japanese, and Chinese.