Dragonscale mask resembling a green dragon's head

Equipment info

Armour slot(s): Head

Also known as: worm str mask

Prestige information: Prestigious

Acquired from: Haak-Edlnji, the chaos worm

This weird looking mask is made from green coloured dragonscales. 
It resembles a head of a dragon. The mouth of the mask seems to be openable
and it opens and closes when you are wearing the mask and open or close your own mouth. 
You wonder if it has some special function.
It is of high quality, and it is in perfect condition.
It looks like it would cover your head slot.
Aura of prestige surrounds the item.
It seems small and very light weight.

Identification report (MK1):

It is made of dragonscale, and it is worn on your head.
Its type is standard, and it has a basic armour class (ac).
It is of good quality.
It has an average positive effect on your resistance against acid damage.
It has a basic positive effect on your strength.
It grants its wearer a possibility to 'breath acid' if there is enough power in it that time.
It occasionally drains spell points to increase its current power.
It has enough power in it at the moment for the breath ability.