Liem Amarin is a wildcat, one of the few wildcats working under Vilaya. He's the first to bring up Green Isle as a point of attack in private conversation with Rakefang. He was a member of a small band Vilaya kicks out for incompetence.
He and his fellow soldiers decide to attack Green Isle to get back in their mistress' good graces.
He has a personal vendetta against their High Rhulain, Tiria Wildlough, for what she did to Riggu Felis and intends to break her mentally and physically.