Difficulty Tiers
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Wiki > Dungeons Of Eternity > Missions > Difficulty Tiers

Tier 1
The easiest mode will allow you to get accustomed to The Combat System. Mimics will expose themselves by shaking and making rumbling sounds. Enemies, including bosses, will be least tough, known as light and standard.
Tier 2
Tier 3
Tier 4
Tier 5
Tier 6
Tier 7: Nightmare Mode
The most difficult tier includes an unkillable enemy Death Reaper