In-game desert walkers

The desert walker is the Alin basic infantry unit. They are created at the sand circle and are upgraded at the sand spire.
Tactic Effect Unlocking requires Upgrade at
Swordsman Standard tactic, replaced by Glass Bolt - -
Whirling Blades Unit takes and deals more damage - -
Glass Bolt Ranged attack, replaces Swordsman Large City Sand Spire
One with Sand Unit becomes invisible while stationary Great City