Simplicity has never been so simple. Well, it has been about 50% "simple", but whatever - it’s still fairly close. Anyways, you’ll need Relm for this, and you’ll need to find the Cultists’ Tower. It is the tower south of Nikeah on the Serpent Trench. Land on it and head inside. Once you meet Strago inside, at the sight of Relm, he’ll leap up in joy and becomes part of the party. By the by, you WILL NOT BE ABLE TO SURVIVE the Cultists’ Tower … yet.