[Lunaryon]

An assassin hired by the villains to kill the party, but takes advantage of being allowed to do things his own way by every now and then attacking the party using more and more of his power so that he is more powerful each time, but in the mean-time appears every now and then with a hint or an item drop. Wanting the heroes to win so that he can empty the vaults of the villains and live the rest of his life at an island resort.