Players learned the wizard was Redski and that he was behind the figurine of gibberling summoning.
Players did not learn why he wanted the gem.
Players tried to keep it from him.
Lukan had the gem, and was dominated. A vampire got the gem, then moved to hand it over to Redski. Redski fought a little bit, but not much. After seeing his vampires shadow shroud go down and having the gem he turned invisible and teleported/flew away. The players killed 2 vampires and another one got away barely alive.