How to get the Demonomicon Achievement/Trophy
To get the Demonomicon achievement/trophy you must Kill 50 enemies with a single demon power. The easiest way to unlock this achievement/trophy is to use an AOE demon power such as Shockwave, Deathmachine, Purgining Flame or Sunray and find an area where 50 weak enemies appear at once. One such place is in the level 'The Ossuary', all you need to do is allow weak skeletons to spawn and develop into a horde and then kill them with your chosen demon spell.
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