A grizzly looking troll hide mask

Lying on the ground appears to be the cut away face of a troll, made into mask form.

Identify

Object 'a grizzly looking troll hide mask'...
It is a level 8 armor, weight 1.
Locations it can be worn:  face
Special properties:  none
Races allowed:  Human Half-Ogre Half-Orc Half-Troll
Genres allowed:  rogue fighter aberrant
This armor has a gold value of 0.
Armor class is 20 of 20.
Affects save vs breath by -1.
Affects save vs spell by -1.
Affects charisma by -2.

Information

• Mob: The giant troll
• Area: Troll Den
• Pop: Yes
• Manufactured: No
• Out of Game: No
• Minimum level: 8
• Maximum Level: 8
• Known keywords: Unknown

Description/Exam

Skinned off of a particularly ugly troll, this hide has been fashioned a
rather durable face mask. Given the troll's natural strength and resistance to
spells, it has also imbued it with protective qualities too. The downside to
this is that it makes the wearer unspeakably ugly.

Notes

Pop rate seems to be about 1 in 10+

Fighter classes with maxed (25) STR can pop it, at any level (verified up to avatar, in fact).

There doesn't seem to be an IP check.

Pulling together all of your considerable strength, you reach down and rip off the face of The 
giant troll.

The corpse of the giant troll holds:
     a grizzly looking troll hide mask