D&D 3.0: Tales from Mystara
Isle of Dawn
Clan Sheeastas was a organization of assassins commanded by a secret family of Rakshasa who were very prominent more than 150 years ago on the nation of Ochalea but were crippled by the government and escaped to the Isle of Dawn were they established their headquarters on the Sorceres Tower. They grew and acquired a powerful control over the rest of the cities but were later disabled by the prominent attack of the Kingdom of the Beasts who ended in both leaders dead.
Ochalea was the place were Clan Sheeastas started hundred of years ago. Is unknown why the Rakshasa arrived from another reality but they tried to eliminate all their counterparts the Rakastas from this reality. The presence of the organization in Ochalea was almost destroyed when 168 years ago the Archiduke of Ochalea declared a war against the Clan when they killed his son and heir. All organizations of mercenaries, samurai, monks and even ninjas moved against the Clan after the promised rewards of one golden statue for each head of a clan leader that could be presented to the Archiduke. Clan Sheeasta leaders escaped to the Isle of Dawn and founded a more secret, secluded, organization that worked more from the shadows than their predecesors.
In the present, Clan Sheeastas has less than 20 cells around the isle of Ochalea who had less than 20 members each. These cells have none or low contact between themselves and only a few had real Rakshasa among them. People still hire Clan Sheeastas because they charge less than other criminal organzations like the Crescent Moon.
Isle of Dawn
In the Isle of Dawn Clan Sheeastas raised in power for more than 160 years expanding their operation to every single criminar business on every single city of the platteau of the Isle of Dawn. The most powerfull leader was Matriarch Nalastia who had the clan growing so fast she was going to expand back into Ochalea.
The organizarion collapsed when a battle between Clan Sheeastas and the Kingdom of the Beasts ended with both leaders dead and the Domain of Leontaur conquering their city Sorceres Tower. Now the Rakshasa are scattered around the world and many have died hunted by their long list of enemies.