Using the tool on that very specific enemy will summon an Avatar, which will make short work of your team if they are not properly equipped. Remember to refrain from using the Skulljack on one of the enemies, the Codex.Skulljack, aside from a good source of Intel, is a perfect weapon against your enemies - the soldier it is used on will always die afterwards, regardless of the result of the hacking process.You can hack enemy mechanized units without breaking concealment, if you refrain from attacking with the unit you've just gained control of.You can perform this maneuver as many times as you want. Starting the hacking process, but not finishing it (when you want to check what the results of a successful hack can give you) does not cost an action point.The only exception to that rule is when you break the security of a key, mission-specific object, like defusing a bomb on a cargo, which will immediately alarm the enemies of your presence. Hacking won't break concealment, provided that it's successful.You should remember about a couple of things when hacking: What's more, soldiers of that class can use their GREMLIN drone to hack from a huge distance, whereas other classes need to be standing next to the object you want them to interact with. This ability is much more versatile when used by a Specialist-class soldier, who can use it on a large number of objects, such as observations towers, as well as on enemy mechanized units (provided that the soldier has the necessary ability).

Hacking is available to all soldier classes, but in that case it's severely limited, allowing most of them to hack objects associated with missions only (such as data-transferring terminals). Hacking allows you to gain access to a wide array of things, which you would normally miss - additional resources, acquisition of a random alien facility on the map, a huge buff to your soldiers, or the possibility to seize control over enemy units. One of the novelties introduced in the second installment of XCOM franchise, at the same time being one of the most important gameplay mechanics you will use while on the battlefield.

Hacking screen displays all the necessary information in a clear, easy to understand way.

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