Creatures that drop heads/skulls
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Drudge Prowlers
Banderling Captain and Chiefs
Mosswart Shamans and Chiefs
Tusker Guard
All (non-Bone) Skeletons
Virindi Master & Director (must take the Broken Mask to Leopold in AB)
Olthoi Noble (must take to the Olthoi Hunter in south Arwic)

Most likely, in the coming patch, all mask-making will cease except for Virindi and Olthoi.

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Virindi Mask Information:

* Virindi Broken Masks, Leopold and the mask maker NPC's will continue to exist after the end of October.

* Obtain a Virindi Broken Mask as loot from either a Virindi Master or Virindi Director.

* Virindi Broken Mask is no-drop no-give.

* "Repairing" the mask
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Giving the Broken Mask to Leopold (in mage tent in Ayan Baqur) yields:
- Virindi Mask, AL 120, (Avg/Avg/Avg/Avg/Unp/Avg/Unp)
- Casts Invulnerability IV, Diff 140
- 1500p, 188 BU

* Repaired Mask is giveable, tradeable, droppable and droppable-on-death.

* Once repaired, it can be taken to any of the three mask makers, and each returns a different "racial" mask:
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* Tsua Kagemata (Sawato, upstairs of Jeweler)
- Ogre Mask, AL 220, (Avg/Avg/P/P/Avg/Avg/B)
- Casts Unarmed Mastery IV, (Diff 0/Sho only/Unarmed>179)
- 2000p, 700 BU

* Janda Sulifiya (Al-Jalima, Armorer building)
- Shadow's Garb, AL 190, (Blw/Avg/Avg/Avg/Avg/Avg/Avg)
- Casts Staff Mastery IV, (Diff 0/Gharu only/Staff>179)
- 2000p, 600 BU

* Alexander the Deft (Eastham, upstairs of Armorer)
- King's Mask, AL 230, (Avg/B/Avg/B/B/B/P)
- Casts Dagger Mastery IV, (Diff 0/Aluvian only/Dagger>179)
- 2000p, 800 BU

* Racial Masks are giveable, tradeable, droppable and droppable-on-death.

* Racial masks CANNOT be exchanged for a different racial type.

* Giving a racial mask to Leopold will result in the loss of your mask.

* There is a quest timer of 3 weeks prior to being able to pick up a second broken mask.