Deus Ex: Human Revolution Interview
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Eurogamer: What are Praxis Points and how do they work?
Jean-Francois Dugas: You earn Experience Points for every mission you complete, every secret you discover, and various other meaningful actions you take. By collecting experience points you will unlock Praxis points - something you need in order to acquire and unlock new augmentation abilities.
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Eurogamer: How does stealth (cloaking) work, exactly? I assume it doesn't last forever, or does it?
Jean-Francois Dugas: It uses energy. We have what we call "passive" and "active" augmentations. All "active" augmentations use energy. When depleted, you can't use it any more. So, you need to find/buy nutrients to recharge your energy cells to use your augmentations again.