Command An Army Skill Tree Guide: Skill Crystals, Upgrades and Farming

What Update 3 Added

Update 3 — the Mongol update — shipped three systems at once: a per-unit Skill Tree, Auto Delete, and an AFK Server. The Skill Tree is the one that changes daily play, because it gives every unit its own upgrade path and a dedicated currency to fund it.

The Currency: Skill Crystals

Skill Crystals feed the Skill Tree, and the farming loop is the same one that funds everything else in Update 3:

The practical read: the daily loop is the Skill Tree budget. Update 3’s economy ties its new currency to the lanes you should already be running, so a missed day costs progression twice.

How It Fits the Three Progression Lanes

Command An Army now has three ways to make a unit stronger, and they answer different questions:

The lanes stack: an evolved, ascended carry with a filled Skill Tree is the strongest single roster slot the game allows. The reverse is also true — Skill Crystals spread across unused units build nothing. Pick one carry (the how to get best units framework), and route your first Skill Crystals there.

The Sibling Systems Worth Knowing

Update 3’s other two systems share the same update notes:

• Auto Delete — quality-of-life for roster management, relevant once Update 3’s new units start multiplying your dupes.
• AFK Server — idle progression lane; pair it with the daily quest loop so offline time still funds the crystals above.

A traits pass shipped in the same update, with every new trait carrying both a buff and a nerf — the community split on the result, so re-check your tier list assumptions before committing Skill Crystals to a unit whose trait was touched.

Sources

Skill Tree, Auto Delete, AFK Server and the Skill Crystal economy: Update 3 patch notes (posted in the game Discord on October 3, 2026) as reported by All Things How’s Update 3 coverage, cross-checked against the official Roblox experience’s Mongols branding on October 7, 2026. Full update breakdown in the Update 3 guide.