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Cathedral of Eternal Night
Defeat Mephistroth within the Cathedral of Eternal Night.
The 'Cathedral of Eternal Night' achievement rewards 10 points for defeating Mephistroth inside the Cathedral of Eternal Night dungeon, introduced in patch 7.2.
Enter Cathedral of Eternal Night
Enter the Cathedral of Eternal Night dungeon and defeat Agronox, the first boss, who spawns Fulminating Lashers during the encounter — kill the adds as they appear.
Defeat Mephistroth
Clear through the dungeon and defeat Mephistroth, the final boss, to complete the achievement.