The Ruler Of Traylar

The town of Traylar was without a ruler for some time after the old lord died without an heir. The local militia decided to host a contest for the seat of Lord or Lady of the town while at the same time getting rid of a local pest, a Rakshasa named Kristak. Four adventurers, one named Broac, responded to the challenge. Whoever brought the head of Kristak to Captain Fardan of the militia first won. The only rule was they had to conduct themselves honorably. Once Kristak was slain, the adventurers could not steal the prize from the winner. They all headed out to a nearby keep where the Rakshasa was rumored to be hiding. Once they entered the keep, though, they found themselves before four doors. Each took a different door, but only one led to the Rakshasa. The other three led to various other monster lairs. No one went home emptyhanded, though. Each monster, including Kristak, had a large gem two were a sapphire and an emerald - in its possession. The four adventurers are the one who found the amethyst, the one who found their stone on the demon, Aria, and the one who found the ruby. Drak didn’t find the ruby, which wasn’t found on the goblin. The demon did not have a blue gem. Either the orc or the goblin was slain by Aria. The orc carried the purple gem. Neither Drak nor Crin slew the orc. Who rules Tralyar?