Time: Around 10:00 PM CST on July 9, 2014
Frequency: 1
World name: Gilgamesh
Character name: M'aiq Silvertongue
Monster name: Amon
Class/Level: BLM 50
Party or solo: Party
Area and coordinates: Syrcus Tower

Description:
When fighting Amon he only auto-attacked and never used any of his abilities or spawned any mobs. mentioned on reddit in this post:

http://www.reddit.com/r/ffxiv/commen..._syrcus_tower/