diff --git a/core/assets/maps/onset.msav b/core/assets/maps/onset.msav
index 80e700c281..7916e15b77 100644
Binary files a/core/assets/maps/onset.msav and b/core/assets/maps/onset.msav differ
diff --git a/core/src/mindustry/content/Blocks.java b/core/src/mindustry/content/Blocks.java
index 7ed54de28f..94e4b0c5b0 100644
--- a/core/src/mindustry/content/Blocks.java
+++ b/core/src/mindustry/content/Blocks.java
@@ -1795,7 +1795,7 @@ public class Blocks{
         }};
 
         ductRouter = new DuctRouter("duct-router"){{
-            requirements(Category.distribution, with(Items.graphite, 8));
+            requirements(Category.distribution, with(Items.graphite, 8, Items.beryllium, 4));
             speed = 4f;
         }};
 
diff --git a/core/src/mindustry/content/ErekirTechTree.java b/core/src/mindustry/content/ErekirTechTree.java
index 9840061cb5..bb9e1b9010 100644
--- a/core/src/mindustry/content/ErekirTechTree.java
+++ b/core/src/mindustry/content/ErekirTechTree.java
@@ -50,7 +50,8 @@ public class ErekirTechTree{
                     });
                 });
 
-                node(constructor, erekirSector, () -> {
+                //TODO further in? no use for these without units.
+                node(constructor, Seq.with(new Research(siliconArcFurnace), erekirSector.first()), () -> {
                     node(payloadLoader, () -> {
                         node(payloadUnloader, () -> {
                             node(payloadPropulsionTower, () -> {
diff --git a/core/src/mindustry/content/SectorPresets.java b/core/src/mindustry/content/SectorPresets.java
index fb27beb6da..3d502c8dcf 100644
--- a/core/src/mindustry/content/SectorPresets.java
+++ b/core/src/mindustry/content/SectorPresets.java
@@ -114,7 +114,7 @@ public class SectorPresets{
 
         onset = new SectorPreset("onset", erekir, 10){{
             addStartingItems = true;
-            captureWave = 4;
+            captureWave = 2;
             difficulty = 1;
         }};
 
diff --git a/core/src/mindustry/io/SaveVersion.java b/core/src/mindustry/io/SaveVersion.java
index 364c853b55..14f41fff7d 100644
--- a/core/src/mindustry/io/SaveVersion.java
+++ b/core/src/mindustry/io/SaveVersion.java
@@ -362,7 +362,7 @@ public abstract class SaveVersion extends SaveFileReader{
 
     public void readWorldEntities(DataInput stream) throws IOException{
         //entityMapping is null in older save versions, so use the default
-        Prov[] mapping = this.entityMapping == null ? EntityMapping.idMap : this.entityMapping;
+        var mapping = this.entityMapping == null ? EntityMapping.idMap : this.entityMapping;
 
         int amount = stream.readInt();
         for(int j = 0; j < amount; j++){