It's like all those Edwardian hunters who, confronted with the gob-smacking scale and profusion of wildlife in the tropics, let fly with both barrels. They had an emotion they needed to express, but they were going entirely the wrong way about it.
So my advice: use the stats for anything you like, but it will always be the undefined parts of your roleplaying world that most captivate the players.
THE SERUG
The Serug are a very ancient and mysterious species,
rarely encountered, living only in certain areas of the forest named after them.
Local woodsmen will sell information about the Serug, but for the most part
this consists of half-truths or outright fabrication.
The principal characteristic of the Serug is their
murderous whimsy. If they decide to interfere with a party of travellers (roughly
20% chance of this each day that the party spends in a Serug area), they will
avoid a direct assault. Instead, they may use crafty diversions to divide the party
and then pick off stragglers, or extinguish campfires with magic and make a
fleeting night raid. The party may catch a glimpse of sinuous draconic forms ,
long many-jointed limbs, a hooked beak or snout – but no clear description
should be given.
Characters will almost certainly never learn,
therefore, that the Serug dwell in a network of tunnels and chambers under the
forest roots, built millennia ago when the species was still relatively sane.
The tunnels are very low, and have sudden twists and slopes which make them
difficult for any but the Serug to use. Entrances are usually within the hollow
trunks of trees, and very well concealed.
The Serug can use all normal battle magic, and also
have their own spells for raising a ground-mist, controlling forest creatures,
and obfuscating or entangling a trail. They see well in darkness, and so prefer
to fight at night if at all. In melee a Serug will strike twice a round, once
with its weapon, once with beak or claw. The usual battle tactic is to
concentrate most of their efforts against one or two individuals, then disengage
when they have inflicted enough damage.
The following are some of the more commonly held
beliefs concerning the Serug. Most are false:
- The Serug live on the moon and climb down to the ground using the tallest trees.
- A Serug is only visible when stationary.
- The Serug are actually a race of mad elves.
- Having draconic ancestry, the Serug never harm dragonnewts.
- There are no Serug, only men wearing costumes to frighten off interlopers.
- The Serug are giant spiders.
- The Serug are phantasms of the mind, and anyone seeing them will go mad.
- The Serug will not attack anyone carrying sprigs of dried heather.
- The Serug can only be hurt by fire.
- The Serug will always leave one member of any group alive to tell the tale.
Players may hear any of these as tavern rumours. Only
the last is in correct, though the referee may choose to have others derive
from a kernel of truth.
ARMOUR: 4 point skin.
SPELLS: Any— typically about six spells per individual
SKILLS: Climbing 90%; Jumping 90%; Set Ambush 75%; Perception
80%; Stealth 80%
I'll leave the last word to Kirk Douglas:

