Monster Train: A. Mechanical Arms Guide

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The A. Mechanical Arms (M-Arm) is a Dimensional Challenge in Monster Train. This guide covers its modifiers, strategy, and the content it unlocks.

Weapons Make The Warrior

Start with glorious equipment that are empowered by Malicka's magics.

Covenant Rank: 1

Primary Clan: Banished / Fel

Allied Clan: Pyreborne / Lady Gilda

Pyre Heart: Heart of the Pact

Modifiers:

Enchanted Armory: Equipment cards cost 0 Ember. Add 3 random Equipment cards to your starting deck.
Amplified Armaments: Attack and health benefits from equipment are doubled.
No Fluff: All cards have 1 fewer upgrade slot.

Completion of this challenge unlocks Trigger Happy and Twofer.

Strategy: This is simply an easier version of Covenant 1, and should not be very difficult. Pick up any equipment you see and combine it to put together extremely powerful cards.

Twofer

Twice as much of all the things that matter.

Covenant Rank: 1

Primary Clan: Pyreborne / Lord Fenix

Allied Clan: Banished / Talos

Pyre Heart: Proto Heartcage

Modifiers:

Two for One: Each time you draft a card, gain a second copy.
Moneybags: Double Gold earned.
Duality: Double stacks of all status effects.

Completion of this challenge unlocks I'm the Enemy Now! and Calculation Station.

Strategy: The Duality modifier makes this challenge fairly easy, since it should be trivial to stack up absurd amounts of Valor on your units and Pyregel on enemies. Additionally, Frenzystone is even more powerful than normal, since it grants Multistrike 2. However, this can make certain Trials like Seal of Aggression, Stone of the Undying, and Thorn Guard more dangerous by adding more Multistrike, Reanimate, and Spikes.

I'm the Enemy Now!

Your units have been picking up ideas from the enemy.

Covenant Rank: 1

Primary Clan: Underlegion / Bolete the Guillotine

Allied Clan: Banished / Talos

Pyre Heart: Proto Heartcage

Modifiers:

Fast Draw: Friendly units get Quick.
Race Ya There: Ascend friendly units at the end of each turn.
One Track Mind: The path you take on the map is chosen automatically.

Completion of this challenge unlocks Stop Hitting Yourself! and Slow and Sloppy.

Strategy: This challenge demonstrates the powerful effect of overstacking. Because Capacity is not much of a concern, Largestones are a powerful upgrade. Also notice how Shift works: any Shift units you draft are likely to activate a lot more than just twice through the automatic Ascending.