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Gamerscore: 20
Achievement Description: Complete the 'Gatekeeper' operation

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Primary Objectives:
- Band of Commanders
- Brothers and Sisters in Arms

Secondary Objectives:
- Research Technology(Soul Ripper)

Hidden Objectives:
- Sultan of Soul

Walkthrough:
Well, you know this place already. However this time it is easier. Set up PDs east with shields and AA and PDs + Shields only to the south. From the east will come regular waves of air and land units along with one Urchinow. From the south, most of the time 2 Urchinows, however you have some time before they appear. Turtle yourself in and once you have enough resources build Soul Rippers.

You need approx. 4 for each base to take down the enemy ACU without much trouble. However you can use Megaliths for the first base as it has weak defenses.