Pishtaco, Fat Eater

I remember watching a episode of Supernatural where a pair of fat eating monsters open a very successful weight loss clinic. Only after one of the monsters starts greedily taking too much fat and killing people do they draw the ire of hunters. I really liked that idea and after doing some research it turns out the monsters, called a Pishtaco, is a local legend from the Andes region in South America. If you want the history & lore check out the wiki here. I'm going to be taking the skeleton of the monster and changing it to better suit what I want it to do.

Here’s the stats real quick:

Pishtaco/Fat Eater
Armor 16, Move 60′, 5 Hit Dice, 22hp, Big Nasty Knife 1d8 then Fat Suck, Morale 9. Fat Suck, the victim makes a Save vs Paralyzation, a failure means they're pinned. At the start of each round a pinned character takes 1d6 Constitution damage and the Fat Eater gains that much hp back as a animated intestine erupts from the Pishtaco's stomach and sucks the fat from the knife wound. At the end of the round the pinned character may make another save to escape.

The Pishtaco looks like a morbidly obese person(usually caucasian) dressed in the local fancy attire. It travels in a carriage with a entourage of followers that wants the “healthy” look the Pishtaco has. The Pishtaco travels town to town offering its services to those who can pay.

The Pishtaco Services

• The Pishtaco can transfer fat from one person to another. When the Pishtaco steals the fat from humans it can't digest it completely and it forms a kind of ambergris in the gut. Once enough fat is gathered it can extracted via vomiting or opening up its stomach upon death. The ambergris can be mixed with water or alcohol(masks the horrid taste) to make a high caloric cocktail. Consuming one pound of Pishtaco ambergris adds 25 lbs of weight once digested and adds 1 Point of Constitution to a maximum of 18. 
• Consuming too much ambergris at once usually leads to heart attack. Save Vs Poison or die for each pound consumed more than twice a day. Note:Make sure to add encumbrance to characters who become overweight.
• Additionally the ambergris has an odd curative effect. If made into a poultice and spread onto a wound it will heal faster and not scar. In game terms a PC heals at twice the usual rate. 
• Candles made with Pishtaco Ambergris last twice as long.

1 lb of Pishtaco Amergriss is worth 500sp to the right people or can be bought from the Pishtaco for a service or some fat, just a bit.