What is Covert skill? What does it for? What is the maximum limit for the Unit Production per 30 minutes? What is Sentry? What does it for? Btw, I have read of us having special link if we have assigned for the army system, where can we find that special link? Thank you in advance....^^

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What is Covert skill? What does it for?

It allows your spies to actually be sneakier. It is not for any other unit as far as I know.

What is the maximum limit for the Unit Production per 30 minutes?

As much as you pay for

What is Sentry? What does it for?

It guards against spies and intelligence agents only.

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