Nodes
Always keep in mind that it's a needed to always have a Power Node on you. Never use them all on the Benches or sell them all should you choose they're not needed. Scattered throughout the game are certain rooms that can only be accessed if you give up a Power Node to open the door. These rooms generally contain a wealth of ammo, or schematics that could produce helpful items. Unlock ever one of these rooms that you can. They're more important than the nodes themselves, especially on the harder difficulties.
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