<ul><li>Upgrading your health is crucial for survival in Doom: The Dark Ages to tackle challenges and fight demons effectively.</li><li>Improving health involves defeating stronger demons, collecting their essence, and upgrading in Sentinel Shrines.</li><li>Health upgrades are obtained by defeating leaders who grant Demonic Essence, identifiable by a blue plus sign above their heads.</li><li>The first leader, Hebeth, is found in the second level and defeating them involves overcoming challenges like armor removal and careful strategy.</li></ul>

How to upgrade health in Doom: The Dark Ages

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