Defence Matrix
From Galaxy Attack: Alien Shooter Wiki
Upon Evolve activation, if you have Defence Matrix selected on your ship, you have a chance to summon a turret that shoots down incoming projectiles.
In practice, this appears like a large shield around your ship, protecting it from bombs and fireballs.
The chance of Defence Matrix triggering is as follows:
| Level 1 | Small |
|---|---|
| Level 2 | Moderate |
| Level 3 | Good |
| Level 4 | Great |
