finished the Armorer's Aid

src/main/java/de/ellpeck/naturesaura/blocks/BlockBlastFurnaceBooster.java

@@ -8,14 +8,25 @@ import net.minecraft.block.HorizontalBlock;
 import net.minecraft.item.BlockItemUseContext;
 import net.minecraft.state.DirectionProperty;
 import net.minecraft.state.StateContainer;
+import net.minecraft.util.math.BlockPos;
+import net.minecraft.util.math.shapes.ISelectionContext;
+import net.minecraft.util.math.shapes.VoxelShape;
+import net.minecraft.util.math.shapes.VoxelShapes;
+import net.minecraft.world.IBlockReader;
 
 public class BlockBlastFurnaceBooster extends BlockContainerImpl {
     public static final DirectionProperty FACING = HorizontalBlock.HORIZONTAL_FACING;
+    private static final VoxelShape SHAPE = VoxelShapes.create(1 / 16F, 0, 1 / 16F, 15 / 16F, 1, 15 / 16F);
 
     public BlockBlastFurnaceBooster() {
         super("blast_furnace_booster", TileEntityBlastFurnaceBooster::new, Block.Properties.from(Blocks.BLAST_FURNACE));
     }
 
+    @Override
+    public VoxelShape getShape(BlockState state, IBlockReader worldIn, BlockPos pos, ISelectionContext context) {
+        return SHAPE;
+    }
+
     @Override
     protected void fillStateContainer(StateContainer.Builder<Block, BlockState> builder) {
         builder.add(FACING);

src/main/java/de/ellpeck/naturesaura/blocks/tiles/TileEntityBlastFurnaceBooster.java

@@ -8,8 +8,14 @@ import net.minecraft.item.crafting.IRecipe;
 import net.minecraft.tileentity.BlastFurnaceTileEntity;
 import net.minecraft.tileentity.ITickableTileEntity;
 import net.minecraft.tileentity.TileEntity;
+import net.minecraft.util.Direction;
 import net.minecraft.util.IIntArray;
 import net.minecraft.util.math.BlockPos;
+import net.minecraftforge.items.CapabilityItemHandler;
+import net.minecraftforge.items.IItemHandler;
+import net.minecraftforge.items.IItemHandlerModifiable;
+
+import javax.annotation.Nonnull;
 
 public class TileEntityBlastFurnaceBooster extends TileEntityImpl implements ITickableTileEntity {
 
@@ -58,4 +64,58 @@ public class TileEntityBlastFurnaceBooster extends TileEntityImpl implements ITi
         PacketHandler.sendToAllAround(this.world, this.pos, 32,
                 new PacketParticles(this.pos.getX(), this.pos.getY(), this.pos.getZ(), PacketParticles.Type.BLAST_FURNACE_BOOSTER, 1));
     }
+
+    @Override
+    public IItemHandlerModifiable getItemHandler(Direction facing) {
+        TileEntity below = this.world.getTileEntity(this.pos.down());
+        if (!(below instanceof BlastFurnaceTileEntity))
+            return null;
+        IItemHandler handler = below.getCapability(CapabilityItemHandler.ITEM_HANDLER_CAPABILITY, Direction.UP).orElse(null);
+        if (handler == null)
+            return null;
+        return new IItemHandlerModifiable() {
+            @Override
+            public void setStackInSlot(int slot, @Nonnull ItemStack stack) {
+                if (handler instanceof IItemHandlerModifiable)
+                    ((IItemHandlerModifiable) handler).setStackInSlot(0, stack);
+            }
+
+            @Override
+            public int getSlots() {
+                return 1;
+            }
+
+            @Nonnull
+            @Override
+            public ItemStack getStackInSlot(int slot) {
+                return handler.getStackInSlot(0);
+            }
+
+            @Nonnull
+            @Override
+            public ItemStack insertItem(int slot, @Nonnull ItemStack stack, boolean simulate) {
+                return handler.insertItem(0, stack, simulate);
+            }
+
+            @Nonnull
+            @Override
+            public ItemStack extractItem(int slot, int amount, boolean simulate) {
+                return handler.extractItem(0, amount, simulate);
+            }
+
+            @Override
+            public int getSlotLimit(int slot) {
+                return handler.getSlotLimit(0);
+            }
+
+            @Override
+            public boolean isItemValid(int slot, @Nonnull ItemStack stack) {
+                return handler.isItemValid(0, stack);
+            }
+        };
+    }
+
+    @Override
+    public void dropInventory() {
+    }
 }

src/main/resources/assets/naturesaura/lang/en_us.json

@@ -53,6 +53,7 @@
     "block.naturesaura.dimension_rail_end": "Rail of the End",
     "block.naturesaura.dimension_rail_nether": "Rail of the Nether",
     "block.naturesaura.projectile_generator": "Shooting Mark",
+    "block.naturesaura.blast_furnace_booster": "Armorer's Aid",
     "item.naturesaura.eye": "Environmental Eye",
     "item.naturesaura.eye_improved": "Environmental Ocular",
     "item.naturesaura.gold_fiber": "Brilliant Fiber",

src/main/resources/data/naturesaura/patchouli_books/book/en_us/entries/using/blast_furnace_booster.json

@@ -0,0 +1,21 @@
+{
+    "name": "Armorer's Aid",
+    "icon": "naturesaura:blast_furnace_booster",
+    "category": "using",
+    "advancement": "naturesaura:offering",
+    "pages": [
+        {
+            "type": "text",
+            "text": "Ever since villager scientists have discovered the use of higher tier materials to create a $(item)Blast Furnace$(), magical botanists have attempted to further improve upon this technology. They have found that $(aura) might be capable of purifying any kind of $(thing)ore$() to a point where it has a chance of producing $(thing)two ingots$() rather than one."
+        },
+        {
+            "type": "text",
+            "text": "These capabilities can be introduced through an $(item)Armorer's Aid$(), which simply has to be placed on top of a $(item)Blast Furnace$().$(p)It should be noted, for the sake of $(thing)automation$(), that ores can be inserted into any side of the $(item)Armorer's Aid$() using a $(item)Hopper$() or similar device. This will cause the items to end up in the smelting area as if they were fed directly into the top of the $(item)Blast Furnace$()."
+        },
+        {
+            "type": "crafting",
+            "text": "Creating the $(item)Armorer's Aid$()",
+            "recipe": "naturesaura:blast_furnace_booster"
+        }
+    ]
+}

src/main/resources/data/naturesaura/recipes/blast_furnace_booster.json

@@ -0,0 +1,28 @@
+{
+    "type": "minecraft:crafting_shaped",
+    "pattern": [
+        "CCC",
+        "THT",
+        "IBI"
+    ],
+    "key": {
+        "H": {
+            "item": "naturesaura:furnace_heater"
+        },
+        "B": {
+            "item": "minecraft:blast_furnace"
+        },
+        "T": {
+            "item": "naturesaura:token_terror"
+        },
+        "C": {
+            "item": "minecraft:cobblestone"
+        },
+        "I": {
+            "item": "naturesaura:infused_iron"
+        }
+    },
+    "result": {
+        "item": "naturesaura:blast_furnace_booster"
+    }
+}