How about
:
A Grulsnak
Climate: Dark, damp caves
Frequency: Uncommon
Organisation: solitary
Activity Cycle: ehr... what's this?
Diet: Orcs, Goblins and other cave dwellers under 6'
Intelligence: Very to High (11 to 14)
Thaco: 2
Ac: -1
Special Defense: Immunity to +1 or lower weapons, immunity to poison
Special Attack: ehr... Poison strike, killing blow, vomit
These biped monstrosities eat almost anything that comes within reach. Though Grulsnaks dislike both the sun and the moon, they are known to leave their lairs on clouded nights. Once it spots a prey the Grishnak vomits out corrosive acids which eat through armour and weapons alike, after which the beast slays it's meal with a single blow. Even though they usually don't hunt for food, they'll make an exception for wingless Avariel...
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The last arrow of Legolas kindled in the air as it flew,
and plunged burning into the heart of a great wolf-chieftain.
All the others fled. -J.R.R. Tolkien, The Lord of the Rings
