Erekir tech tree tweaks

core/src/mindustry/content/Blocks.java

@@ -2181,6 +2181,7 @@ public class Blocks{
             hasLiquids = true;
             outputLiquid = new LiquidStack(Liquids.water, 5f / 60f / 9f);
             liquidCapacity = 20f;
+            researchCostMultiplier = 0.2f;
         }};
 
         //TODO rename
@@ -2386,6 +2387,7 @@ public class Blocks{
             tier = 4;
             size = 2;
             range = 4;
+            researchCostMultiplier = 0.2f;
 
             consumes.liquid(Liquids.hydrogen, 0.25f / 60f).boost();
         }};

core/src/mindustry/content/ErekirTechTree.java

@@ -168,7 +168,7 @@ public class ErekirTechTree{
                 });
             });
 
-            node(breach, () -> {
+            node(breach, Seq.with(new Research(siliconArcFurnace)), () -> {
                 node(berylliumWall, () -> {
                     node(berylliumWallLarge, () -> {
 

core/src/mindustry/content/UnitTypes.java

@@ -2702,6 +2702,7 @@ public class UnitTypes{
             lowAltitude = false;
             mineWalls = true;
             mineFloor = false;
+            mineHardnessScaling = false;
             flying = true;
             mineSpeed = 4f;
             mineTier = 4;
@@ -2763,6 +2764,7 @@ public class UnitTypes{
             mineWalls = true;
             targetAir = false;
             mineFloor = false;
+            mineHardnessScaling = false;
             mineSpeed = 5f;
             mineTier = 4;
             buildSpeed = 1.4f;
@@ -2822,6 +2824,7 @@ public class UnitTypes{
             targetAir = false;
             mineWalls = true;
             mineFloor = false;
+            mineHardnessScaling = false;
             mineSpeed = 6f;
             mineTier = 4;
             buildSpeed = 2f;