Tech tree tweaks

core/src/mindustry/content/Blocks.java

@@ -3608,6 +3608,7 @@ public class Blocks{
             moveTime = 35f;
             canOverdrive = false;
             health = 800;
+            researchCostMultiplier = 4f;
         }};
 
         reinforcedPayloadRouter = new PayloadRouter("reinforced-payload-router"){{
@@ -3615,6 +3616,7 @@ public class Blocks{
             moveTime = 35f;
             health = 800;
             canOverdrive = false;
+            researchCostMultiplier = 4f;
         }};
 
         payloadMassDriver = new PayloadMassDriver("payload-mass-driver"){{

core/src/mindustry/content/ErekirTechTree.java

@@ -20,6 +20,8 @@ public class ErekirTechTree{
         costMultipliers.put(Items.phaseFabric, 4);
         costMultipliers.put(Items.thorium, 9);
         costMultipliers.put(Items.graphite, 9);
+        //oxide is hard to make
+        costMultipliers.put(Items.oxide, 0.5f);
 
         //TODO remove
         Objective tmpNever = new Research(Items.fissileMatter);