diff --git a/spec/support/ds4rolls.spec.ts b/spec/support/ds4rolls.spec.ts
index 054f6818..ec899376 100644
--- a/spec/support/ds4rolls.spec.ts
+++ b/spec/support/ds4rolls.spec.ts
@@ -71,11 +71,55 @@ describe("DS4 Rolls with one die and no modifications.", () => {
     });
 });
 
+describe("DS4 Rolls with one die and slaying dice, first throw.", () => {
+    it("Should do a crit success on `1`", () => {
+        const rollProvider = mockSingleThrow(1);
+
+        expect(rollCheckSingleDie(4, { useSlayingDice: true } as RollOptions, rollProvider)).toEqual(
+            new RollResult(4, RollResultStatus.CRITICAL_SUCCESS, [1]),
+        );
+    });
+
+    it("Should do a crit fail on `20`", () => {
+        const rollProvider = mockSingleThrow(20);
+
+        expect(rollCheckSingleDie(4, { useSlayingDice: true } as RollOptions, rollProvider)).toEqual(
+            new RollResult(0, RollResultStatus.CRITICAL_FAILURE, [20]),
+        );
+    });
+});
+
+describe("DS4 Rolls with one die and slaying dice, followup throw.", () => {
+    it("Should do a crit success on `1`", () => {
+        const rollProvider = mockSingleThrow(1);
+
+        expect(
+            rollCheckSingleDie(4, { useSlayingDice: true, slayingDiceRepetition: true } as RollOptions, rollProvider),
+        ).toEqual(new RollResult(4, RollResultStatus.CRITICAL_SUCCESS, [1]));
+    });
+
+    it("Should do a regular fail on `20`", () => {
+        const rollProvider = mockSingleThrow(20);
+
+        expect(
+            rollCheckSingleDie(4, { useSlayingDice: true, slayingDiceRepetition: true } as RollOptions, rollProvider),
+        ).toEqual(new RollResult(0, RollResultStatus.FAILURE, [20]));
+    });
+
+    it("Should do a regular success on `20` with a test value of 20", () => {
+        const rollProvider = mockSingleThrow(20);
+
+        expect(
+            rollCheckSingleDie(20, { useSlayingDice: true, slayingDiceRepetition: true } as RollOptions, rollProvider),
+        ).toEqual(new RollResult(20, RollResultStatus.SUCCESS, [20]));
+    });
+});
+
 describe("DS4 Rolls with one die and crit roll modifications.", () => {
     it("Should do a crit success on `1`.", () => {
         const rollProvider = mockSingleThrow(1);
 
-        expect(rollCheckSingleDie(4, { maxCritSucc: 2, minCritFail: 19 }, rollProvider)).toEqual(
+        expect(rollCheckSingleDie(4, { maxCritSucc: 2, minCritFail: 19 } as RollOptions, rollProvider)).toEqual(
             new RollResult(4, RollResultStatus.CRITICAL_SUCCESS, [1]),
         );
     });
@@ -83,7 +127,7 @@ describe("DS4 Rolls with one die and crit roll modifications.", () => {
     it("Should do a crit success on `maxCritSucc`.", () => {
         const rollProvider = mockSingleThrow(2);
 
-        expect(rollCheckSingleDie(4, { maxCritSucc: 2, minCritFail: 19 }, rollProvider)).toEqual(
+        expect(rollCheckSingleDie(4, { maxCritSucc: 2, minCritFail: 19 } as RollOptions, rollProvider)).toEqual(
             new RollResult(4, RollResultStatus.CRITICAL_SUCCESS, [2]),
         );
     });
@@ -91,7 +135,7 @@ describe("DS4 Rolls with one die and crit roll modifications.", () => {
     it("Should do a success on lower edge case `3`.", () => {
         const rollProvider = mockSingleThrow(3);
 
-        expect(rollCheckSingleDie(4, { maxCritSucc: 2, minCritFail: 19 }, rollProvider)).toEqual(
+        expect(rollCheckSingleDie(4, { maxCritSucc: 2, minCritFail: 19 } as RollOptions, rollProvider)).toEqual(
             new RollResult(3, RollResultStatus.SUCCESS, [3]),
         );
     });
@@ -99,7 +143,7 @@ describe("DS4 Rolls with one die and crit roll modifications.", () => {
     it("Should do a success on upper edge case `18`.", () => {
         const rollProvider = mockSingleThrow(18);
 
-        expect(rollCheckSingleDie(4, { maxCritSucc: 2, minCritFail: 19 }, rollProvider)).toEqual(
+        expect(rollCheckSingleDie(4, { maxCritSucc: 2, minCritFail: 19 } as RollOptions, rollProvider)).toEqual(
             new RollResult(0, RollResultStatus.FAILURE, [18]),
         );
     });
@@ -107,7 +151,7 @@ describe("DS4 Rolls with one die and crit roll modifications.", () => {
     it("Should do a crit fail on `minCritFail`.", () => {
         const rollProvider = mockSingleThrow(19);
 
-        expect(rollCheckSingleDie(4, { maxCritSucc: 2, minCritFail: 19 }, rollProvider)).toEqual(
+        expect(rollCheckSingleDie(4, { maxCritSucc: 2, minCritFail: 19 } as RollOptions, rollProvider)).toEqual(
             new RollResult(0, RollResultStatus.CRITICAL_FAILURE, [19]),
         );
     });
@@ -115,7 +159,7 @@ describe("DS4 Rolls with one die and crit roll modifications.", () => {
     it("Should do a crit fail on `20`", () => {
         const rollProvider = mockSingleThrow(20);
 
-        expect(rollCheckSingleDie(4, { maxCritSucc: 2, minCritFail: 19 }, rollProvider)).toEqual(
+        expect(rollCheckSingleDie(4, { maxCritSucc: 2, minCritFail: 19 } as RollOptions, rollProvider)).toEqual(
             new RollResult(0, RollResultStatus.CRITICAL_FAILURE, [20]),
         );
     });
diff --git a/src/module/rolls/roll-executor.ts b/src/module/rolls/roll-executor.ts
index 204f5edc..102be1db 100644
--- a/src/module/rolls/roll-executor.ts
+++ b/src/module/rolls/roll-executor.ts
@@ -85,6 +85,8 @@ export function rollCheckMultipleDice(
 export class RollOptions {
     public maxCritSucc = 1;
     public minCritFail = 20;
+    public useSlayingDice = false;
+    public slayingDiceRepetition = false;
 }
 
 export class RollResult {