For those of you who don't know, Narcosa is a Google+ crowd sourced supplement to add a drug-fuelled tinge to your standard fantasy campaign, with rules for substances, new locations, NPCs, monsters and spells all under the general theme of getting fucked up.
Rafael Chandler mentions the Powder Born, a sect of psychos who snort the powdered bones of Rainbow Wyverns, making them freaky meth-head killers who try to erase their previous lives (up to killing their families and trying to burn down anywhere they had been before they took their first hit).
Crazy shit, and an excellent version of the 1d20 Bandits on the Wilderness table, but there's one thing missing - there's no stats for the Rainbow Wyverns!
To keep a cult of druggies going, either you get a lot of bones out of one big wyvern, or there's tons of them around. I decided to do both, cause they're both pretty cool ideas.
Stats for LL (check this handy guide to convert to you system of choice)
No. Enc: 1 (1d4)
Move: 120' (40')
Hoard Class: None
The Rainbow Wyvern is a strange creature indeed. While it resembles a common wyvern in size and shape, its scales scintillate lazily when relaxed, but when threatened they burst into iridescent fury, causing onlookers to suffer a variety of effects.
If exposed to the wyvern's scales, make a Save vs. Spells. If you fail, roll on the table below.
1. The patterns are pretty pleasing - lose your actions for this round.
2. Images swell and disappear - any attacks you make against the wyvern are made as if it was under the effect of a blur spell.
3. Momentarily, the patterns match their surroundings - you consider the Wyvern invisible this round.
4. The patterns become spiked, all claws and primal fury - the Wyvern is considered to have Frightful Presence as a dragon.
If you succeed the save, you realise the truth of the Rainbow Wyvern - its scale produce the illusion of a wyvern, but underneath that, there's a dog-sized lizard. Think like a Magic Eye picture, where the Wyvern slides out of view to reveal the true wyvern.
Once the real wyvern is spotted, use the stats for a dog, or something small and relatively useless.
Each of these wyverns can be ground up to produce 1d4 doses of Powder.
Big-Ass Rainbow Wyvern
Use the stats for a Wyvern, and add the ability to cast Illusion spells as a MU of its HD. Its smart enough to use its illusions to set up ambushes and hide its lair. This Wyvern is a total bastard to catch, but each corpse can make 2d6 doses of Powder per HD.