Chalk stood bewildered.
“Wasn’t there just somebody there? An elf, I think,” the wizard said, still a bit stunned.
Gnybaro looked down the empty alley, then looked at Chalk. The thief raised an eyebrow.
“I think I see a bird fluttering in the eaves of that house, but no, no elves,” he replied.
Chalk shook his head to remove the cobwebs.
Both adventurers stood for a moment and watched the blackbird as it seemed to frantically be trying to get into a small nook or cranny in the nearby building.
Suddenly the bird grew before their eyes, feathers vanished and a creature the size of a halfling could be clearly seen, exposed to the light of the sun, it clawed down the side of the building to drop unceremoniously to the ground. It was purple skinned and hunched over, milky white eyes looking for an escape.
“What in the eleven hells is that?” Gnybaro asked Chalk.
“I don’t know, but it doesn’t look right,” answered the wily sorcerer.
Just then Koram and Valance came around a corner. In that moment the strange creature shifted its form again, becoming a large, oily pelted rat, and proceeded to scamper under the old building. Chalk fired of a lightning bolt, but the creature was too fast and was gone before the spell arced from his hands.
“What was that? A rat? Why waste spells on such frivolous things?” inquired Koram.
Chalk sighed and looked at Gnybaro. “Yes, why indeed? I am sure that whatever it was, it will visit us again. I just hope I am awake when it does.”
No. Enc.: 1 (2d4)
Movement: 120′ (40′)
Fly: 180′ (60′)
Swim: 90′ (30′)
Armor Class: 7
Hit Dice: 2+3
Damage: 1d6 (claw or bite in natural shape) or varies by shape assumed
Hoard Class: XVII
The threlg is a rather annoying monster to chase as it can change its shape to resemble any creature that it has knowledge of, if only for short periods of time. While it only takes a few seconds to change shape, this new form can be maintained for a few minutes or longer, depending on how far removed this new shape is from their original, humanoid form. For example, changing into the form of an elf is fairly easy for the creature and can be maintained for up to 12 hours (or until the creature falls asleep), but changing to resemble a centaur is more taxing and can be maintained for 1d4 hours. Becoming a bird or an octopus or a large animal like an elephant, for example, is very taxing on the threlg and these shapes can only be held for 2d6 minutes. Note that no special abilities (like dragon’s breathe weapons) are conveyed to the threlg when it takes such a form, only natural weapons and basic attacks (an elephant’s stomping or a manticore’s tail spikes, for example). Damage in these forms will vary as per the shape assumed (referees should reference the Monster section). These creatures cannot mimic a specific individual, as a doppleganger would and will only appear as a sort of “generic” representation of the creature type that they are immitating.
In its natural form, a threlg is a short, hairless humanoid creature with purplish skin, long black claws and milky white eyes. Bands of these creatures sometimes pillage small villages and towns, raiding all of the valuables that they can and then hurrying off to change shape into humans or elves to spend all of their ill-gotten gains in mindless revelry.