Index: binaries/data/mods/public/simulation/data/technologies/training_advanced_mercenary.json
===================================================================
--- /dev/null
+++ binaries/data/mods/public/simulation/data/technologies/training_advanced_mercenary.json
@@ -0,0 +1,8 @@
+{
+	"autoResearch": true,
+	"icon": "upgrade_advanced.png",
+	"tooltip": "Advanced mercenaries train slower.",
+	"requirements": { "tech": "upgrade_rank_advanced_mercenary" },
+	"modifications": [{ "value": "Cost/BuildTime", "multiply": 1.20 }],
+	"affects": ["Mercenary Advanced"]
+}
Index: binaries/data/mods/public/simulation/data/technologies/upgrade_rank_advanced_mercenary.json
===================================================================
--- /dev/null
+++ binaries/data/mods/public/simulation/data/technologies/upgrade_rank_advanced_mercenary.json
@@ -0,0 +1,14 @@
+{
+	"genericName": "Expertise In War",
+	"icon": "upgrade_advanced.png",
+	"description": "Hire professional mercenaries to fight in your army.",
+	"cost": {"food": 200, "wood": 0, "stone": 0, "metal": 300},
+	"requirements": { "all": [{ "tech": "phase_town" }, { "any": [{ "civ": "athen"}, { "civ": "cart"}, { "civ": "mace"}, { "civ": "ptol"}, { "civ": "sele"}] }] },
+	"requirementsTooltip": "Unlocked in Town Phase.",
+	"icon": "upgrade_advanced.png",
+	"researchTime": 40,
+	"tooltip": "Mercenary units train at advanced rank but +20% training time.",
+	"modifications": [{ "value": "Promotion/RequiredXp", "replace": 0 }],
+	"soundComplete": "interface/alarm/alarm_upgradearmory.xml",
+	"affects": ["Mercenary Basic"]
+}
Index: binaries/data/mods/public/simulation/templates/structures/athen_barracks.xml
===================================================================
--- binaries/data/mods/public/simulation/templates/structures/athen_barracks.xml
+++ binaries/data/mods/public/simulation/templates/structures/athen_barracks.xml
@@ -21,6 +21,11 @@
   <Obstruction>
     <Static width="20.0" depth="20.0"/>
   </Obstruction>
+  <ProductionQueue>
+    <Technologies datatype="tokens">
+      upgrade_rank_advanced_mercenary
+    </Technologies>
+  </ProductionQueue>
   <VisualActor>
     <Actor>structures/athenians/barracks.xml</Actor>
     <FoundationActor>structures/fndn_5x5.xml</FoundationActor>
Index: binaries/data/mods/public/simulation/templates/structures/mace_barracks.xml
===================================================================
--- binaries/data/mods/public/simulation/templates/structures/mace_barracks.xml
+++ binaries/data/mods/public/simulation/templates/structures/mace_barracks.xml
@@ -27,6 +27,7 @@
       units/{civ}_champion_cavalry_barracks
     </Entities>
     <Technologies datatype="tokens">
+      upgrade_rank_advanced_mercenary
       unlock_champion_units
     </Technologies>
   </ProductionQueue>
Index: binaries/data/mods/public/simulation/templates/template_structure_civic_civil_centre_military_colony.xml
===================================================================
--- binaries/data/mods/public/simulation/templates/template_structure_civic_civil_centre_military_colony.xml
+++ binaries/data/mods/public/simulation/templates/template_structure_civic_civil_centre_military_colony.xml
@@ -43,6 +43,7 @@
     <Technologies datatype="tokens">
       -phase_town
       -phase_city
+      upgrade_rank_advanced_mercenary
     </Technologies>
   </ProductionQueue>
   <Sound>
Index: binaries/data/mods/public/simulation/templates/template_structure_military_embassy.xml
===================================================================
--- binaries/data/mods/public/simulation/templates/template_structure_military_embassy.xml
+++ binaries/data/mods/public/simulation/templates/template_structure_military_embassy.xml
@@ -35,6 +35,9 @@
   </Obstruction>
   <ProductionQueue>
     <BatchTimeModifier>0.8</BatchTimeModifier>
+    <Technologies datatype="tokens">
+      upgrade_rank_advanced_mercenary
+    </Technologies>
   </ProductionQueue>
   <Sound>
     <SoundGroups>