Index: binaries/data/mods/public/simulation/components/Formation.js
===================================================================
--- binaries/data/mods/public/simulation/components/Formation.js
+++ binaries/data/mods/public/simulation/components/Formation.js
@@ -187,13 +187,29 @@
 /**
  * Returns the 'primary' member of this formation (typically the most
  * important unit type), for e.g. playing a representative sound.
- * Returns undefined if no members.
- * TODO: actually implement something like that; currently this just returns
- * the arbitrary first one.
+ *
+ * @return {number | undefined} The entity ID of "the most important" unit in the formation
+ *					or undefined if the formation has no entities.
  */
 Formation.prototype.GetPrimaryMember = function()
 {
-	return this.members[0];
+	let heroes = [];
+	let champs = [];
+	let soldrs = [];
+	for (let ent of this.members)
+	{
+		let cmpIdentity = Engine.QueryInterface(ent, IID_Identity);
+		if (!cmpIdentity)
+			continue;
+		if (cmpIdentity.HasClass("Hero"))
+			heroes.push(ent);
+		if (cmpIdentity.HasClass("Champion"))
+			champs.push(ent);
+		if (cmpIdentity.HasClass("Soldier"))
+			soldrs.push(ent);
+	}
+	return pickRandom(heroes) || pickRandom(champs) ||
+		pickRandom(soldrs) || this.members[0];
 };
 
 /**