diff --git a/src/data/layers/management.tsx b/src/data/layers/management.tsx
index 9b2359e..d4e7eb5 100644
--- a/src/data/layers/management.tsx
+++ b/src/data/layers/management.tsx
@@ -75,6 +75,9 @@ const layer = createLayer(id, () => {
         }
         return elfLevel;
     });
+    const totalElfExp = computed(() =>
+        Object.values(elfTraining).reduce((acc, curr) => acc.add(curr.exp.value), new Decimal(0))
+    );
 
     // ------------------------------------------------------------------------------- Upgrades
 
@@ -169,7 +172,8 @@ const layer = createLayer(id, () => {
             createMultiplicativeModifier(() => ({
                 multiplier: focusMulti,
                 description: "Focus Multiplier",
-                enabled: () => Decimal.gt(focusTime.value, 0) && focusTargets.value[elf.name] == true
+                enabled: () =>
+                    Decimal.gt(focusTime.value, 0) && focusTargets.value[elf.name] == true
             })),
             ...modifiers
         ]);
@@ -390,7 +394,11 @@ const layer = createLayer(id, () => {
         createMilestone(() => ({
             display: {
                 requirement: "Jack Level 4",
-                effectDisplay: "Oil gain is multiplied based on total elf levels."
+                effectDisplay: jsx(() => (
+                    <>
+                        Oil gain is multiplied by <Sqrt>total elf levels</Sqrt>.
+                    </>
+                ))
             },
             visibility: () =>
                 showIf(heatedCutterElfMilestones[2].earned.value && main.day.value >= 13),
@@ -903,8 +911,8 @@ const layer = createLayer(id, () => {
                     );
             }
         }
-        focusTime.value = Decimal.sub(focusTime.value, diff).max(0)
-        focusCooldown.value = Decimal.sub(focusCooldown.value, diff).max(0)
+        focusTime.value = Decimal.sub(focusTime.value, diff).max(0);
+        focusCooldown.value = Decimal.sub(focusCooldown.value, diff).max(0);
         if (Decimal.eq(focusTime.value, 0)) {
             focusMulti.value = Decimal.pow(
                 focusMaxMulti.value,
@@ -993,7 +1001,7 @@ const layer = createLayer(id, () => {
     function rerollFocusTargets(range: number, count: DecimalSource) {
         let x = 0;
         focusTargets.value = {};
-        const newCount = Decimal.min(count, range)
+        const newCount = Decimal.min(count, range);
         while (newCount.gte(x)) {
             const roll = Object.values(elfTraining)[Math.floor(Math.random() * range)]?.name ?? "";
             if (!focusTargets.value[roll]) {
@@ -1267,6 +1275,7 @@ const layer = createLayer(id, () => {
 
         elfTraining,
         totalElfLevels,
+        totalElfExp,
         currentShown,
         generalTabCollapsed,
 
diff --git a/src/data/layers/metal.tsx b/src/data/layers/metal.tsx
index c0c06cd..81d0166 100644
--- a/src/data/layers/metal.tsx
+++ b/src/data/layers/metal.tsx
@@ -12,6 +12,7 @@ import { persistent } from "game/persistence";
 import { globalBus } from "game/events";
 import {
     createAdditiveModifier,
+    createExponentialModifier,
     createMultiplicativeModifier,
     createSequentialModifier
 } from "game/modifiers";
@@ -30,6 +31,7 @@ import boxes from "./boxes";
 import cloth from "./cloth";
 import plastic from "./plastic";
 import dyes from "./dyes";
+import management from "./management";
 
 const id = "metal";
 const day = 7;
@@ -78,6 +80,11 @@ const layer = createLayer(id, function (this: BaseLayer) {
             multiplier: () => Decimal.add(cloth.cloth.value, 1).log10().plus(1),
             description: "Glistening Paint",
             enabled: dyes.upgrades.redDyeUpg.bought
+        })),
+        createExponentialModifier(() => ({
+            exponent: 1.1,
+            description: "Mary Level 4",
+            enabled: management.elfTraining.heatedPlanterElfTraining.milestones[3].earned
         }))
     ]);
     const computedOrePurity = computed(() => orePurity.apply(0.1));
@@ -108,6 +115,11 @@ const layer = createLayer(id, function (this: BaseLayer) {
             multiplier: () => Decimal.add(plastic.activeRefinery.value, 1).sqrt(),
             description: "De Louvre",
             enabled: dyes.upgrades.redDyeUpg2.bought
+        })),
+        createMultiplicativeModifier(() => ({
+            multiplier: () => Decimal.div(management.totalElfExp.value, 1000).add(1).sqrt(),
+            description: "Mary Level 5",
+            enabled: management.elfTraining.heatedPlanterElfTraining.milestones[4].earned
         }))
     ]);
     const computedAutoSmeltSpeed = computed(() => autoSmeltSpeed.apply(0));
diff --git a/src/data/layers/oil.tsx b/src/data/layers/oil.tsx
index aa7a515..f4636ba 100644
--- a/src/data/layers/oil.tsx
+++ b/src/data/layers/oil.tsx
@@ -35,6 +35,7 @@ import { formatGain } from "util/bignum";
 import plastic from "./plastic";
 import paper from "./paper";
 import dyes from "./dyes";
+import management from "./management";
 
 const id = "oil";
 const day = 9;
@@ -247,8 +248,8 @@ const layer = createLayer(id, function (this: BaseLayer) {
                 <br />
                 Pump that oil from the ground.
                 <br />
-                Gain oil based on the number of Heavy buildings active and well
-                depth, but coal usage is multiplied by {row2Upgrades[3].bought.value ? 4 : 5}×.
+                Gain oil based on the number of Heavy buildings active and well depth, but coal
+                usage is multiplied by {row2Upgrades[3].bought.value ? 4 : 5}×.
                 <br />
                 <br />
                 Currently:
@@ -718,6 +719,11 @@ const layer = createLayer(id, function (this: BaseLayer) {
             multiplier: () => coalEffectiveness.value,
             description: "Effectiveness",
             enabled: () => Decimal.lt(coalEffectiveness.value, 1)
+        })),
+        createMultiplicativeModifier(() => ({
+            multiplier: () => Decimal.sqrt(management.totalElfLevels.value),
+            description: "Jack Level 4",
+            enabled: management.elfTraining.heatedCutterElfTraining.milestones[3].earned
         }))
     ]);
     const computedOilSpeed = computed(() => oilSpeed.apply(0));
diff --git a/src/data/layers/plastic.tsx b/src/data/layers/plastic.tsx
index 3e3717e..ddaf7a5 100644
--- a/src/data/layers/plastic.tsx
+++ b/src/data/layers/plastic.tsx
@@ -32,6 +32,7 @@ import boxes from "./boxes";
 import metal from "./metal";
 import oil from "./oil";
 import dyes from "./dyes";
+import management from "./management";
 
 const id = "plastic";
 const day = 10;
@@ -66,7 +67,11 @@ const layer = createLayer(id, function (this: BaseLayer) {
         resource: metal.metal,
         cost() {
             const v = new Decimal(this.amount.value);
-            return Decimal.pow(1.2, v).times(1e7);
+            let cost = Decimal.pow(1.2, v).times(1e7);
+            if (management.elfTraining.fertilizerElfTraining.milestones[3].earned.value) {
+                cost = Decimal.sub(cost, Decimal.pow(plastic.value, 2)).max(0);
+            }
+            return cost;
         },
         display: jsx(() => (
             <>
@@ -299,11 +304,16 @@ const layer = createLayer(id, function (this: BaseLayer) {
             <>
                 {render(trackerDisplay)}
                 <Spacer />
-                <MainDisplay resource={plastic} color={color} style="margin-bottom: 0"  effectDisplay={
+                <MainDisplay
+                    resource={plastic}
+                    color={color}
+                    style="margin-bottom: 0"
+                    effectDisplay={
                         Decimal.gt(computedPlasticGain.value, 0)
                             ? `+${format(computedPlasticGain.value)}/s`
                             : undefined
-                    } />
+                    }
+                />
                 <Spacer />
                 <Column>
                     {render(buildRefinery)}