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diff --git a/src/Generating/DungeonRoomsFinisher.cpp b/src/Generating/DungeonRoomsFinisher.cpp
new file mode 100644
index 000000000..f213455d6
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+++ b/src/Generating/DungeonRoomsFinisher.cpp
@@ -0,0 +1,279 @@
+
+// DungeonRoomsFinisher.cpp
+
+// Declares the cDungeonRoomsFinisher class representing the finisher that generates dungeon rooms
+
+#include "Globals.h"
+#include "DungeonRoomsFinisher.h"
+#include "../FastRandom.h"
+
+
+
+
+
+/** Height, in blocks, of the internal dungeon room open space. This many air blocks Y-wise. */
+static const int ROOM_HEIGHT = 4;
+
+
+
+
+
+////////////////////////////////////////////////////////////////////////////////
+// cDungeonRoom:
+
+class cDungeonRoom :
+	public cGridStructGen::cStructure
+{
+	typedef cGridStructGen::cStructure super;
+
+public:
+
+	cDungeonRoom(
+		int a_GridX, int a_GridZ,
+		int a_OriginX, int a_OriginZ,
+		int a_HalfSizeX, int a_HalfSizeZ,
+		int a_FloorHeight,
+		cNoise & a_Noise
+	) :
+		super(a_GridX, a_GridZ, a_OriginX, a_OriginZ),
+		m_StartX(a_OriginX - a_HalfSizeX),
+		m_EndX(a_OriginX + a_HalfSizeX),
+		m_StartZ(a_OriginZ - a_HalfSizeZ),
+		m_EndZ(a_OriginZ + a_HalfSizeZ),
+		m_FloorHeight(a_FloorHeight)
+	{
+		/*
+		Pick coords next to the wall for the chests.
+		This is done by indexing the possible coords, picking any one for the first chest
+		and then picking another position for the second chest that is not adjacent to the first pos
+		*/
+		int rnd = a_Noise.IntNoise2DInt(a_OriginX, a_OriginZ) / 7;
+		int SizeX = m_EndX - m_StartX - 1;
+		int SizeZ = m_EndZ - m_StartZ - 1;
+		int NumPositions = 2 * SizeX + 2 * SizeZ;
+		int FirstChestPos = rnd % NumPositions;  // The corner positions are a bit more likely, but we don't mind
+		rnd = rnd / 512;
+		int SecondChestPos = (FirstChestPos + 2 + (rnd % (NumPositions - 3))) % NumPositions;
+		m_Chest1 = DecodeChestCoords(FirstChestPos,  SizeX, SizeZ);
+		m_Chest2 = DecodeChestCoords(SecondChestPos, SizeX, SizeZ);
+	}
+
+protected:
+
+	// The X range of the room, start inclusive, end exclusive:
+	int m_StartX, m_EndX;
+
+	// The Z range of the room, start inclusive, end exclusive:
+	int m_StartZ, m_EndZ;
+
+	/** The Y coord of the floor of the room */
+	int m_FloorHeight;
+
+	/** The (absolute) coords of the first chest. The Y coord represents the chest's Meta value (facing). */
+	Vector3i m_Chest1;
+
+	/** The (absolute) coords of the second chest. The Y coord represents the chest's Meta value (facing). */
+	Vector3i m_Chest2;
+
+
+
+	/** Decodes the position index along the room walls into a proper 2D position for a chest. */
+	Vector3i DecodeChestCoords(int a_PosIdx, int a_SizeX, int a_SizeZ)
+	{
+		if (a_PosIdx < a_SizeX)
+		{
+			// Return a coord on the ZM side of the room:
+			return Vector3i(m_StartX + a_PosIdx + 1, E_META_CHEST_FACING_ZP, m_StartZ + 1);
+		}
+		a_PosIdx -= a_SizeX;
+		if (a_PosIdx < a_SizeZ)
+		{
+			// Return a coord on the XP side of the room:
+			return Vector3i(m_EndX - 1, E_META_CHEST_FACING_XM, m_StartZ + a_PosIdx + 1);
+		}
+		a_PosIdx -= a_SizeZ;
+		if (a_PosIdx < a_SizeX)
+		{
+			// Return a coord on the ZP side of the room:
+			return Vector3i(m_StartX + a_PosIdx + 1, E_META_CHEST_FACING_ZM, m_StartZ + 1);
+		}
+		a_PosIdx -= a_SizeX;
+		// Return a coord on the XM side of the room:
+		return Vector3i(m_StartX + 1, E_META_CHEST_FACING_XP, m_StartZ + a_PosIdx + 1);
+	}
+
+
+
+	/** Fills the specified area of blocks in the chunk with the specified blocktype if they are one of the overwritten block types.
+	The coords are absolute, start coords are inclusive, end coords are exclusive. */
+	void ReplaceCuboid(cChunkDesc & a_ChunkDesc, int a_StartX, int a_StartY, int a_StartZ, int a_EndX, int a_EndY, int a_EndZ, BLOCKTYPE a_DstBlockType)
+	{
+		int BlockX = a_ChunkDesc.GetChunkX() * cChunkDef::Width;
+		int BlockZ = a_ChunkDesc.GetChunkZ() * cChunkDef::Width;
+		int RelStartX = Clamp(a_StartX - BlockX, 0, cChunkDef::Width - 1);
+		int RelStartZ = Clamp(a_StartZ - BlockZ, 0, cChunkDef::Width - 1);
+		int RelEndX   = Clamp(a_EndX - BlockX,   0, cChunkDef::Width);
+		int RelEndZ   = Clamp(a_EndZ - BlockZ,   0, cChunkDef::Width);
+		for (int y = a_StartY; y < a_EndY; y++)
+		{
+			for (int z = RelStartZ; z < RelEndZ; z++)
+			{
+				for (int x = RelStartX; x < RelEndX; x++)
+				{
+					if (cBlockInfo::CanBeTerraformed(a_ChunkDesc.GetBlockType(x, y, z)))
+					{
+						a_ChunkDesc.SetBlockType(x, y, z, a_DstBlockType);
+					}
+				}  // for x
+			}  // for z
+		}  // for z
+	}
+
+
+
+	/** Fills the specified area of blocks in the chunk with a random pattern of the specified blocktypes, if they are one of the overwritten block types.
+	The coords are absolute, start coords are inclusive, end coords are exclusive. The first blocktype uses 75% chance, the second 25% chance. */
+	void ReplaceCuboidRandom(cChunkDesc & a_ChunkDesc, int a_StartX, int a_StartY, int a_StartZ, int a_EndX, int a_EndY, int a_EndZ, BLOCKTYPE a_DstBlockType1, BLOCKTYPE a_DstBlockType2)
+	{
+		int BlockX = a_ChunkDesc.GetChunkX() * cChunkDef::Width;
+		int BlockZ = a_ChunkDesc.GetChunkZ() * cChunkDef::Width;
+		int RelStartX = Clamp(a_StartX - BlockX, 0, cChunkDef::Width - 1);
+		int RelStartZ = Clamp(a_StartZ - BlockZ, 0, cChunkDef::Width - 1);
+		int RelEndX   = Clamp(a_EndX - BlockX,   0, cChunkDef::Width);
+		int RelEndZ   = Clamp(a_EndZ - BlockZ,   0, cChunkDef::Width);
+		cFastRandom rnd;
+		for (int y = a_StartY; y < a_EndY; y++)
+		{
+			for (int z = RelStartZ; z < RelEndZ; z++)
+			{
+				for (int x = RelStartX; x < RelEndX; x++)
+				{
+					if (cBlockInfo::CanBeTerraformed(a_ChunkDesc.GetBlockType(x, y, z)))
+					{
+						BLOCKTYPE BlockType = (rnd.NextInt(101) < 75) ? a_DstBlockType1 : a_DstBlockType2;
+						a_ChunkDesc.SetBlockType(x, y, z, BlockType);
+					}
+				}  // for x
+			}  // for z
+		}  // for z
+	}
+
+
+
+	/** Tries to place a chest at the specified (absolute) coords.
+	Does nothing if the coords are outside the chunk. */
+	void TryPlaceChest(cChunkDesc & a_ChunkDesc, const Vector3i & a_Chest)
+	{
+		int RelX = a_Chest.x - a_ChunkDesc.GetChunkX() * cChunkDef::Width;
+		int RelZ = a_Chest.z - a_ChunkDesc.GetChunkZ() * cChunkDef::Width;
+		if (
+			(RelX < 0) || (RelX >= cChunkDef::Width) ||  // The X coord is not in this chunk
+			(RelZ < 0) || (RelZ >= cChunkDef::Width)     // The Z coord is not in this chunk
+		)
+		{
+			return;
+		}
+		a_ChunkDesc.SetBlockTypeMeta(RelX, m_FloorHeight + 1, RelZ, E_BLOCK_CHEST, (NIBBLETYPE)a_Chest.y);
+
+		// TODO: Fill the chest with random loot
+	}
+
+
+
+	// cGridStructGen::cStructure override:
+	virtual void DrawIntoChunk(cChunkDesc & a_ChunkDesc) override
+	{
+		if (
+			(m_EndX   <  a_ChunkDesc.GetChunkX() * cChunkDef::Width) ||
+			(m_StartX >= a_ChunkDesc.GetChunkX() * cChunkDef::Width + cChunkDef::Width) ||
+			(m_EndZ   <  a_ChunkDesc.GetChunkZ() * cChunkDef::Width) ||
+			(m_StartZ >= a_ChunkDesc.GetChunkZ() * cChunkDef::Width + cChunkDef::Width)
+		)
+		{
+			// The chunk is not intersecting the room at all, bail out
+			return;
+		}
+		int b = m_FloorHeight + 1;  // Bottom
+		int t = m_FloorHeight + 1 + ROOM_HEIGHT;  // Top
+		ReplaceCuboidRandom(a_ChunkDesc, m_StartX, m_FloorHeight, m_StartZ, m_EndX + 1, b, m_EndZ + 1, E_BLOCK_MOSSY_COBBLESTONE, E_BLOCK_COBBLESTONE);  // Floor
+		ReplaceCuboid(a_ChunkDesc, m_StartX + 1, b, m_StartZ + 1, m_EndX, t, m_EndZ, E_BLOCK_AIR);  // Insides
+
+		// Walls:
+		ReplaceCuboid(a_ChunkDesc, m_StartX, b, m_StartZ, m_StartX + 1, t, m_EndZ,       E_BLOCK_COBBLESTONE);  // XM wall
+		ReplaceCuboid(a_ChunkDesc, m_EndX,   b, m_StartZ, m_EndX + 1,   t, m_EndZ,       E_BLOCK_COBBLESTONE);  // XP wall
+		ReplaceCuboid(a_ChunkDesc, m_StartX, b, m_StartZ, m_EndX + 1,   t, m_StartZ + 1, E_BLOCK_COBBLESTONE);  // ZM wall
+		ReplaceCuboid(a_ChunkDesc, m_StartX, b, m_EndZ,   m_EndX + 1,   t, m_EndZ + 1,   E_BLOCK_COBBLESTONE);  // ZP wall
+
+		// Place chests:
+		TryPlaceChest(a_ChunkDesc, m_Chest1);
+		TryPlaceChest(a_ChunkDesc, m_Chest2);
+
+		// Place the spawner:
+		int CenterX = (m_StartX + m_EndX) / 2 - a_ChunkDesc.GetChunkX() * cChunkDef::Width;
+		int CenterZ = (m_StartZ + m_EndZ) / 2 - a_ChunkDesc.GetChunkZ() * cChunkDef::Width;
+		if (
+			(CenterX >= 0) && (CenterX < cChunkDef::Width) &&
+			(CenterZ >= 0) && (CenterZ < cChunkDef::Width)
+		)
+		{
+			a_ChunkDesc.SetBlockTypeMeta(CenterX, b, CenterZ, E_BLOCK_MOB_SPAWNER, 0);
+			// TODO: Set the spawned mob
+		}
+	}
+} ;
+
+
+
+
+
+
+////////////////////////////////////////////////////////////////////////////////
+// cDungeonRoomsFinisher:
+
+cDungeonRoomsFinisher::cDungeonRoomsFinisher(cTerrainHeightGen & a_HeightGen, int a_Seed, int a_GridSize, int a_MaxSize, int a_MinSize, const AString & a_HeightDistrib) :
+	super(a_Seed + 100, a_GridSize, a_GridSize, a_GridSize, a_GridSize, a_MaxSize, a_MaxSize, 1024),
+	m_HeightGen(a_HeightGen),
+	m_MaxHalfSize((a_MaxSize + 1) / 2),
+	m_MinHalfSize((a_MinSize + 1) / 2),
+	m_HeightProbability(cChunkDef::Height)
+{
+	// Initialize the height probability distribution:
+	m_HeightProbability.SetDefString(a_HeightDistrib);
+
+	// Normalize the min and max size:
+	if (m_MinHalfSize > m_MaxHalfSize)
+	{
+		std::swap(m_MinHalfSize, m_MaxHalfSize);
+	}
+}
+
+
+
+
+
+
+cDungeonRoomsFinisher::cStructurePtr cDungeonRoomsFinisher::CreateStructure(int a_GridX, int a_GridZ, int a_OriginX, int a_OriginZ)
+{
+	// Select a random room size in each direction:
+	int rnd = m_Noise.IntNoise2DInt(a_OriginX, a_OriginZ) / 7;
+	int HalfSizeX = m_MinHalfSize + (rnd % (m_MaxHalfSize - m_MinHalfSize + 1));
+	rnd = rnd / 32;
+	int HalfSizeZ = m_MinHalfSize + (rnd % (m_MaxHalfSize - m_MinHalfSize + 1));
+	rnd = rnd / 32;
+
+	// Select a random floor height for the room, based on the height generator:
+	int ChunkX, ChunkZ;
+	int RelX = a_OriginX, RelY = 0, RelZ = a_OriginZ;
+	cChunkDef::AbsoluteToRelative(RelX, RelY, RelZ, ChunkX, ChunkZ);
+	cChunkDef::HeightMap HeightMap;
+	m_HeightGen.GenHeightMap(ChunkX, ChunkZ, HeightMap);
+	int Height = cChunkDef::GetHeight(HeightMap, RelX, RelZ);  // Max room height at {a_OriginX, a_OriginZ}
+	Height = Clamp(m_HeightProbability.MapValue(rnd % m_HeightProbability.GetSum()), 10, Height - 5);
+
+	// Create the dungeon room descriptor:
+	return cStructurePtr(new cDungeonRoom(a_GridX, a_GridZ, a_OriginX, a_OriginZ, HalfSizeX, HalfSizeZ, Height, m_Noise));
+}
+
+
+
+