diff --git a/mods/crimson.js b/mods/crimson.js
new file mode 100644
index 00000000..1eb5a42f
--- /dev/null
+++ b/mods/crimson.js
@@ -0,0 +1,262 @@
+//TODO: crimtane, enemies
+//Not doing: spawning
+//Might not be possible: thorns (its breaking behavior would need a way for a pixel to detect when a pixel tryMove'd into its position)
+
+function includesArray(parentArray, testArray) {
+    for (let i = 0; i < parentArray.length; i++) {
+        if (parentArray[i].every(function(value, index) { return value === testArray[index]})) {
+            return true;
+        }
+    }
+    return false;
+}
+
+crimRate = 0.002
+
+function grassSpread(pixel,dirt,grass) {
+	pixel.dirtArray = [] //initialize dirt neighbor list
+	for (i = -3; i < 4; i++) { //iterate around
+		for (j = -3; j < 4; j++) {
+			if (!isEmpty(pixel.x+i,pixel.y+j,true)) { //check for a pixel to see if it's dirt
+				if(Array.isArray(dirt)) {
+					if(dirt.includes(pixelMap[pixel.x+i][pixel.y+j].element)) { //see if it's dirt
+						if(!includesArray(pixel.dirtArray,[i,j])) { //avoid duplicate dirt entry
+							pixel.dirtArray.push([i,j]) //store dirt
+						}
+					}
+				} else {
+					if(pixelMap[pixel.x+i][pixel.y+j].element == dirt) { //see if it's dirt
+						if(!includesArray(pixel.dirtArray,[i,j])) { //avoid duplicate dirt entry
+							pixel.dirtArray.push([i,j]) //store dirt
+						}
+					}
+				}
+			}
+		}
+	}
+	for (k = 0; k < pixel.dirtArray.length; k++) { //iterate through dirt list
+		if(Math.random() < crimRate*3.5) { //random chance
+			if(isEmpty(pixel.x+pixel.dirtArray[k][0],pixel.y+pixel.dirtArray[k][1]-1)) { //check for empty space to grow grass
+				createPixel(grass,pixel.x+pixel.dirtArray[k][0],pixel.y+pixel.dirtArray[k][1]-1) //place grass above dirt
+			}
+		}
+	}
+}
+
+function crimSpread(pixel) { //corrupting (crimsonning?) blocks
+	for (i = -3; i < 4; i++) { 
+		for (j = -3; j < 4; j++) {
+			if(i == 0 && j == 0) {
+				continue
+			}
+			if(!isEmpty(pixel.x+i,pixel.y+j,true)) {
+				if(pixelMap[pixel.x+i][pixel.y+j].element == "grass") {
+					if(Math.random() < crimRate) {
+						changePixel(pixelMap[pixel.x+i][pixel.y+j],"crimson_grass")
+					}
+				} else if(pixelMap[pixel.x+i][pixel.y+j].element == "rock") {
+					if(Math.random() < crimRate) {
+						changePixel(pixelMap[pixel.x+i][pixel.y+j],"crimstone")
+					}
+				} else if(pixelMap[pixel.x+i][pixel.y+j].element == "sand") {
+					if(Math.random() < crimRate) {
+						changePixel(pixelMap[pixel.x+i][pixel.y+j],"crimsand")
+					}
+				} else if(pixelMap[pixel.x+i][pixel.y+j].element == "ice") {
+					if(Math.random() < crimRate) {
+						changePixel(pixelMap[pixel.x+i][pixel.y+j],"red_ice")
+					}
+				} else if(pixelMap[pixel.x+i][pixel.y+j].element == "gravel") {
+					if(Math.random() < crimRate) {
+						changePixel(pixelMap[pixel.x+i][pixel.y+j],"crimgravel")
+					}
+				} else if(pixelMap[pixel.x+i][pixel.y+j].element == "water") {
+					if(Math.random() < crimRate*3) {
+						changePixel(pixelMap[pixel.x+i][pixel.y+j],"crimwater")
+					}
+				} else if(pixelMap[pixel.x+i][pixel.y+j].element == "snow") {
+					if(Math.random() < crimRate) {
+						changePixel(pixelMap[pixel.x+i][pixel.y+j],"crimsnow")
+					}
+				}
+			}
+		}
+	}
+	grassSpread(pixel,["dirt","mud"],"crimson_grass") //fuck evil biomes turning mud into dirt
+}
+
+elements.crimson_grass = {
+    color: ["#e82535","#cc471f","#d6153c","#c20e29","#b81a2c"],
+    behavior: [
+        "XX|CR:vicious_mushroom%0.01|XX",
+        "XX|XX|XX",
+        "XX|M1|XX",
+    ],
+    tick: function(pixel) {
+        if(!pixel.ft) {
+            pixel.ft = 0
+        }
+        if(pixel.ft % 3 == 0) { 
+			crimSpread(pixel)
+        }
+		pixel.ft++
+    },
+    tempHigh: 100,
+    stateHigh: "dead_plant",
+    tempLow: -2,
+    stateLow: "frozen_plant",
+    burn:50,
+    burnTime:20,
+    category:"life",
+    state: "solid",
+    density: 1400,
+}
+
+elements.crimstone = {
+	color: ["#cb4444", "#953333", "#611c1c", "#b43434", "#752424"],
+	behavior: behaviors.POWDER,
+    tick: function(pixel) {
+        if(!pixel.ft) {
+            pixel.ft = 0
+        }
+        if(pixel.ft % 3 == 0) { 
+			crimSpread(pixel)
+        }
+        pixel.ft++
+    },
+	tempHigh: 950,
+	stateHigh: "magma",
+	category: "land",
+	state: "solid",
+	density: 2550,
+	hardness: 0.5,
+	breakInto: ["crimsand","crimgravel"],
+}
+
+elements.crimsand = {
+	color: ["#4c4c44", "#6c645c", "#5c544c", "#847c6c", "#24241c", "#4c4c44", "#6c645c", "#5c544c", "#847c6c", "#24241c", "#3c140c", "#842c24"],
+	behavior: behaviors.POWDER,
+    tick: function(pixel) {
+        if(!pixel.ft) {
+            pixel.ft = 0
+        }
+        if(pixel.ft % 3 == 0) { 
+			crimSpread(pixel)
+        }
+        pixel.ft++
+    },
+	tempHigh: 1700,
+	stateHigh: "molten_glass",
+	category: "land",
+	state: "solid",
+	density: 1602,
+}
+
+elements.red_ice = {
+	color: ["#f0ccc5", "#f7d8d2", "#eba39b"],
+	behavior: behaviors.WALL,
+    tick: function(pixel) {
+        if(!pixel.ft) {
+            pixel.ft = 0
+        }
+        if(pixel.ft % 3 == 0) { 
+			crimSpread(pixel)
+        }
+        pixel.ft++
+    },
+	temp: 0,
+	tempHigh: 5,
+	stateHigh: "crimwater",
+	category: "solids",
+	state: "solid",
+	density: 917,
+	breakInto: "crimsnow",
+}
+
+elements.crimgravel = { //break from canon for crimstone breakInto
+	color: ["#c4533f", "#de6957", "#b84639", "#cf4634", "#db6758", "#d17366", "#ab2b2b"],
+	behavior: behaviors.POWDER,
+    tick: function(pixel) {
+        if(!pixel.ft) {
+            pixel.ft = 0
+        }
+        if(pixel.ft % 3 == 0) { 
+			crimSpread(pixel)
+        }
+        pixel.ft++
+    },
+	category:"land",
+	tempHigh: 950,
+	stateHigh: "magma",
+	state: "solid",
+	density: 1680,
+	hardness: 0.2,
+}
+
+elements.crimwater = { //you shouldn't be able to purify ice by melting it
+	color: "#e45c7c",
+	behavior: behaviors.LIQUID,
+    tick: function(pixel) {
+        if(!pixel.ft) {
+            pixel.ft = 0
+        }
+        if(pixel.ft % 3 == 0) { 
+			crimSpread(pixel)
+        }
+        pixel.ft++
+    },
+	tempLow: 0,
+	stateLow: "red_ice",
+	viscosity: 1,
+	category: "liquids",
+	reactions: {
+		"quicklime": { "elem1": null, "elem2": "slaked_lime", },
+		"ruins": { "elem2": "rock", "chance": 0.00035 },
+	},
+	state: "liquid",
+	density: 997,
+	conduct: 0.02,
+	stain: 0.1,
+}
+
+elements.crimsnow = { //BIG break from canon but you shouldn't be able to purify ice by grinding it either
+	color: "#fce1e4",
+	behavior: behaviors.POWDER,
+    tick: function(pixel) {
+        if(!pixel.ft) {
+            pixel.ft = 0
+        }
+        if(pixel.ft % 3 == 0) { 
+			crimSpread(pixel)
+        }
+        pixel.ft++
+    },
+	temp: 0,
+	tempHigh: 5,
+	stateHigh: "crimwater",
+	category: "land",
+	state: "solid",
+	density: 100,
+}
+
+elements.vicious_mushroom = {
+	color: "#e36554",
+	behavior: behaviors.POWDER,
+    tick: function(pixel) {
+        if(!pixel.ft) {
+            pixel.ft = 0
+        }
+        if(pixel.ft % 3 == 0) { 
+			crimSpread(pixel)
+        }
+        pixel.ft++
+    },
+	category: "life",
+	hidden: true,
+	tempHigh: 225,
+	stateHigh: "fire",
+	burn: 10,
+	burnTime: 65,
+	state: "solid",
+	density: 90.445,
+}
\ No newline at end of file