Doom Guardian

Location: Valley of Doom
Level: 50
Difficulty: 4 stars
Total HP: 12,530
Attacks:

• Doom Blast: 216-264
• Shadow Noise: 216-264

Temporary Items Dropped:

• Blackened Key (Dropped during the 'Get the Key' quest)

Items Dropped:

• Shadow Token x2
• Treasure Chest (Misc)

Note: Also see Shadow of Sepulchure (Cape).

Thanks to rruurruu77.