Completing Unit Upgrades in Monster Train 2: A Solving Guide

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Monster Train 2 offers numerous options for upgrading your units, including permanent buffs and the Merchants of Steel, found between battles. These merchants provide a variety of unique upgrades, such as Largestone, Immortalstone, and Mossystone. To upgrade your units, you’ll need to spend gold. By default, each card has two upgrade slots, with the option to increase this limit using an artifact.

This guide will detail all the unit upgrades available in the game, including how to obtain additional upgrades through Celestial Alcoves and various game events.

How to Upgrade Your Units

Upgrades in Monster Train 2 mainly happen at the Merchants of Steel. These upgrade rooms appear between battles during your journey.

During each visit to the shop, you’ll find four upgrade options, and you’re allowed one reroll to see a different set of choices. These options can vary greatly in price, and the more valuable upgrades usually require over 100 gold.

Additionally, you can acquire upgrades from the Celestial Alcove, a rare upgrade room that may offer various events, including unit upgrades like Titanskin.

The room following the first battle will always feature both a Merchant of Steel and a Merchant of Magic.

All Unit Upgrades in Monster Train 2

Merchant shop with multiple card upgrades in Monster Train 2

Here’s a rundown of all the unit upgrades you can find from the Merchant of Steel.

Upgrade Name	Upgrade	Upgrade Effect
Strengthstone	Upgrade a unit with Martial 14.	Grants an additional 14 attack.
Mossystone	Upgrade a unit with Regen 10.	Restores 10 health per turn.
Smidgestone	Reduce a unit’s Ember cost by one.	Lowers the Ember cost by 1.
Heartstone	Upgrade a unit to gain +20 health.	Grants an extra 20 health.
Frankenstone	Upgrade a unit with Reanimate 1.	The unit revives once when defeated.
Titanstone	Upgrade a unit with Titanite.	Reduces incoming damage.
Frenzystone	Upgrade a unit with Multistrike 1.	Allows your unit to attack multiple times.
Speedstone	Upgrade a unit with Quick and apply +10 Martial.	Lets your unit attack before enemies and adds extra attack.
Immortalstone	Upgrade a unit with Endless.	Returns the card to your hand if it’s defeated.
Dualstone	Upgrade a unit to gain Dualism.	Double buffs and debuffs applied by this unit.