From the Harbinger quest introduced in the Into the Darkness event.

Mutilator Head
Value: 200
1,050 Burden Units


Notes

You give Olthoi Hunter Mutilator Head.
You've earned 10,000 experience.
Olthoi Hunter gives you Mutilator Helm.
Olthoi Hunter tells you, "You're lucky you survived. All we can deduce about the smallest of the olthoi assault troops is that they serve the purpose of entering small places. They also are the fastest and strongest of their species. Wear this helmet with pride, you have earned the respect of many with this kill."