Not even a monster. With apologies to PPnM

There is a wyrm native to the coastal kingdom of Ghanaligh, hundreds of feet long but the thickness of a stout rope, which can control the colours of its iridescent, shimmering scales to make any pattern or image. Its body is somewhat deformable and prone to elaborate coiling: it loves to lie pancake-flat on oriental rugs or hang from rods masquerading as a tapestry. It has no claws and only weak fangs, laced with a poison that provokes sleep or ravenous hunger. It is chiefly prized for its breath weapon, however, a cloud of illusion-inducing smoke, covering a 30′ cube. The illusions are controlled by the dragon’s will but filtered through the victim’s interpretation: they are considered prophetic by the longtail adepts of the far west. They always begin with the removal of all threats and a sensation of peace (the dragon, if spotted, might be shown escaping or melting into air or otherwise being neutralized), and continue as long as the dragon remains nearby. Anyone affected will have their morale raised and concentration lowered by 1d4 for 30-CON hours and may be subject to shreds or suggestions of illusion for years afterward.

Away from Ghanaligh the dragon’s scales become dull and lose their colour-changing ability. Those of the maghreb are said to be red or black, and notably resinous.

No. Enc.: 1-4
Alignment: you decide. OR Chaotic Good
Movement: lethargic unless frightened. Then 50′ a round. Cannot jump
Armor Class:3. It’s hard to see and dodges well, but it’s also a great big rope
Hit Dice: 5
Attacks: bite (1d3 plus save vs. poison: 1-3 sleep: 4-6 hunger compulsion)
Save: F5
Morale: 10
XP: 20. What are you doing attacking this harmless, peaceful creature? And no, its effects do not remind me of anything else. It’s about the wonder of childhood. Honestly!