Unending Avatar

Location: Time Void
Level: 39
Difficulty: 4 stars
Total HP: 18,000
Attacks:

• Acid Spit: 277-339
• Slam: 277-339

Temporary Items Dropped:

• Avatar Essence (Dropped during the 'A Cycle Unending' quest)
• Avatar Slain (Dropped during the 'Unending Avatar' quest)
• Everlasting Scale (Dropped during the 'The First Task' quest)
• Evolution of Awe (Used in the 'Awe of Evolution' quests) (Must have completed the 'Find the Runes!' quest)
• Shard of a Soul (Dropped during the 'Soulider' quest)
• Void Opal (Dropped during the 'Void Opal' quest)

Items Dropped:

• Ancient Frying Pan
• Condensed Mana (Dropped during the 'Aptitude Test' and 'Let's Get You a Suit' quests)
• Kindred's Valiance Armor
• Kindred's Valiance Hat
• Metal head
• Silver Rapier
• Treasure Chest (Misc)
• Unending Avatar Essence

Note: Also see Dread Avatar.

Thanks to Cahyo kurosaki, Gengstupid, Kein Engel, Rich Wind and rickyb20.