Rankord
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The Necromancer storyline is a side quest and doesn't affect the overall walkthrough. Perhaps you meant the energy needed to complete the quest (I don't remember the exact name anymore). It's located on the map, guarded by phoenixes, somewhere to the right and above the center of the map.
Oh, thank you, honestly, I would never have guessed. In the quest for the key, it's called dark energy, and I guess it's clear why the association immediately came to mind with necromancers, rather than a cloud guarded by phoenixes :D
