diff --git a/core/assets/maps/five.msav b/core/assets/maps/five.msav
deleted file mode 100644
index 8c64894b92..0000000000
Binary files a/core/assets/maps/five.msav and /dev/null differ
diff --git a/core/src/mindustry/content/ErekirTechTree.java b/core/src/mindustry/content/ErekirTechTree.java
index bdb049527e..8d7e24bb59 100644
--- a/core/src/mindustry/content/ErekirTechTree.java
+++ b/core/src/mindustry/content/ErekirTechTree.java
@@ -102,7 +102,7 @@ public class ErekirTechTree{
                 node(reinforcedPayloadConveyor, Seq.with(new OnSector(four)), () -> {
                     //TODO should only be unlocked in unit sector
                     node(constructor, Seq.with(new Research(siliconArcFurnace), new OnSector(four)), () -> {
-                        node(payloadMassDriver, Seq.with(new OnSector(five)), () -> {
+                        node(payloadMassDriver, Seq.with(new OnSector(four)), () -> {
                             //TODO further limitations
                             node(payloadLoader, () -> {
                                 node(payloadUnloader, () -> {
@@ -133,7 +133,7 @@ public class ErekirTechTree{
             //TODO move into turbine condenser?
             node(plasmaBore, () -> {
                 node(impactDrill, Seq.with(new OnSector(two)), () -> {
-                    node(largePlasmaBore, Seq.with(new OnSector(five)), () -> {
+                    node(largePlasmaBore, Seq.with(new OnSector(four)), () -> {
                         node(eruptionDrill, () -> {
 
                         });
@@ -158,7 +158,7 @@ public class ErekirTechTree{
 
                     node(regenProjector, () -> {
                         //TODO more tiers of build tower or "support" structures like overdrive projectors
-                        node(buildTower, Seq.with(new OnSector(five)), () -> {
+                        node(buildTower, Seq.with(new OnSector(four)), () -> {
 
                         });
                     });
@@ -195,7 +195,7 @@ public class ErekirTechTree{
                                     });
 
                                     node(atmosphericConcentrator, Seq.with(new OnSector(four)), () -> {
-                                        node(cyanogenSynthesizer, Seq.with(new OnSector(five)), () -> {
+                                        node(cyanogenSynthesizer, Seq.with(new OnSector(four)), () -> {
 
                                         });
                                     });
@@ -252,11 +252,11 @@ public class ErekirTechTree{
                 node(diffuse, Seq.with(new OnSector(two)), () -> {
                     node(sublimate, () -> {
                         //TODO implement
-                        node(titan, Seq.with(new OnSector(five)), () -> {
+                        node(titan, Seq.with(new OnSector(four)), () -> {
 
                         });
 
-                        node(disperse, Seq.with(new OnSector(five)), () -> {
+                        node(disperse, Seq.with(new OnSector(four)), () -> {
 
                         });
                     });
@@ -313,7 +313,7 @@ public class ErekirTechTree{
                                     });
                                 });
 
-                                node(shipAssembler, Seq.with(new OnSector(five)), () -> {
+                                node(shipAssembler, Seq.with(new OnSector(four)), () -> {
                                     node(UnitTypes.quell, () -> {
                                         node(UnitTypes.disrupt, Seq.with(tmpNever), () -> {
 
@@ -339,10 +339,7 @@ public class ErekirTechTree{
                 node(two, Seq.with(new SectorComplete(onset), new Research(ductRouter), new Research(ductBridge)), () -> {
                     node(three, Seq.with(new SectorComplete(two), new Research(ventCondenser)), () -> {
                         node(four, Seq.with(new SectorComplete(three)), () -> {
-                            //TODO doesn't work
-                            node(five, Seq.with(new SectorComplete(four), tmpNever), () -> {
 
-                            });
                         });
                     });
                 });
diff --git a/core/src/mindustry/content/SectorPresets.java b/core/src/mindustry/content/SectorPresets.java
index efdd1cb896..dddfdf9003 100644
--- a/core/src/mindustry/content/SectorPresets.java
+++ b/core/src/mindustry/content/SectorPresets.java
@@ -16,7 +16,7 @@ public class SectorPresets{
     impact0078, desolateRift, nuclearComplex, planetaryTerminal,
     coastline, navalFortress,
 
-    onset, two, three, four, five
+    onset, two, three, four
     ;
 
     public static void load(){
@@ -230,10 +230,6 @@ public class SectorPresets{
             };
         }};
 
-        five = new SectorPreset("five", erekir, 12){{
-            difficulty = 7;
-        }};
-
         //endregion
     }
 }