diff --git a/__tests__/fysadStatsSeasonal.csv b/__tests__/fysadStatsSeasonal.csv
new file mode 100644
index 0000000..fb7dfd3
--- /dev/null
+++ b/__tests__/fysadStatsSeasonal.csv
@@ -0,0 +1,82 @@
+1,2277,4600000000
+15,99,200000000
+28,99,200000000
+18,99,200000000
+7,99,200000000
+8,99,200000000
+11,99,200000000
+32,99,200000000
+159,99,200000000
+15,99,200000000
+12,99,200000000
+9,99,200000000
+48,99,200000000
+4,99,200000000
+3,99,200000000
+25,99,200000000
+5,99,200000000
+23,99,200000000
+12,99,200000000
+2,99,200000000
+19,99,200000000
+7,99,200000000
+4,99,200000000
+4,99,200000000
+-1,-1
+-1,-1
+-1,-1
+-1,-1
+-1,-1
+-1,-1
+-1,-1
+347584,22
+-1,-1
+-1,-1
+-1,-1
+-1,-1
+-1,-1
+-1,-1
+-1,-1
+-1,-1
+-1,-1
+-1,-1
+-1,-1
+-1,-1
+-1,-1
+-1,-1
+-1,-1
+-1,-1
+-1,-1
+-1,-1
+-1,-1
+-1,-1
+-1,-1
+-1,-1
+-1,-1
+-1,-1
+-1,-1
+-1,-1
+-1,-1
+-1,-1
+-1,-1
+-1,-1
+-1,-1
+-1,-1
+-1,-1
+-1,-1
+-1,-1
+-1,-1
+-1,-1
+-1,-1
+-1,-1
+-1,-1
+-1,-1
+-1,-1
+-1,-1
+-1,-1
+-1,-1
+-1,-1
+-1,-1
+-1,-1
+-1,-1
+-1,-1
\ No newline at end of file
diff --git a/__tests__/hiscores.test.ts b/__tests__/hiscores.test.ts
index 412a06a..df0fe44 100644
--- a/__tests__/hiscores.test.ts
+++ b/__tests__/hiscores.test.ts
@@ -10,7 +10,9 @@ import {
   Stats,
   getPlayerTableURL,
   getSkillPageURL,
-  getStatsURL
+  getStatsURL,
+  BOSSES,
+  Boss
 } from '../src/index';
 
 const B0ATY_NAME = 'B0ATY';
@@ -19,6 +21,7 @@ const LYNX_TITAN_SPACE_NAME = 'lYnX tiTaN';
 const LYNX_TITAN_UNDERSCORE_NAME = 'lYnX_tiTaN';
 const LYNX_TITAN_HYPHEN_NAME = 'lYnX-tiTaN';
 const LYNX_TITAN_FORMATTED_NAME = 'Lynx Titan';
+const FYSAD_FORMATTED_NAME = 'Fysad';
 
 const attackTopPage = readFileSync(`${__dirname}/attackTopPage.html`, 'utf8');
 const b0atyNamePage = readFileSync(`${__dirname}/b0atyNamePage.html`, 'utf8');
@@ -27,6 +30,7 @@ const lynxTitanNamePage = readFileSync(
   `${__dirname}/lynxTitanNamePage.html`,
   'utf8'
 );
+const fysadStatsSeasonal = readFileSync(`${__dirname}/fysadStatsSeasonal.csv`, 'utf8');
 
 jest.spyOn(axios, 'get').mockImplementation((url) => {
   const lynxUrls = [
@@ -46,6 +50,9 @@ jest.spyOn(axios, 'get').mockImplementation((url) => {
   if (getStatsURL('main', LYNX_TITAN_FORMATTED_NAME) === url) {
     return Promise.resolve({ status: 200, data: lynxTitanStats });
   }
+  if (getStatsURL('seasonal', FYSAD_FORMATTED_NAME) === url) {
+    return Promise.resolve({ status: 200, data: fysadStatsSeasonal });
+  }
   throw new Error(`No mock response for URL: ${url}`);
 });
 
@@ -441,7 +448,8 @@ test('Get non-existent player', async () => {
 });
 
 test('Get stats by gamemode', async () => {
-  const { skills } = await getStatsByGamemode(LYNX_TITAN_FORMATTED_NAME);
+  const { skills, bosses } = await getStatsByGamemode(LYNX_TITAN_FORMATTED_NAME);
+  
   expect(skills).toMatchObject({
     overall: { rank: expect.any(Number), level: 2277, xp: 4600000000 },
     attack: { rank: expect.any(Number), level: 99, xp: 200000000 },
@@ -468,4 +476,21 @@ test('Get stats by gamemode', async () => {
     hunter: { rank: expect.any(Number), level: 99, xp: 200000000 },
     construction: { rank: expect.any(Number), level: 99, xp: 200000000 }
   });
+
+  const bossKeys = Object.keys(bosses);
+  expect(bossKeys).toStrictEqual(BOSSES);
+
+  expect.assertions(2);
+});
+
+test('Get stats by game mode seasonal (omit TOB: Hard Mode from bosses)', async () => {
+  const {bosses} = await getStatsByGamemode(FYSAD_FORMATTED_NAME, 'seasonal');
+  const bossKeys = Object.keys(bosses);
+
+  const filteredBosses = BOSSES.filter(boss => boss !== 'theatreOfBloodHardMode');
+
+  expect(bossKeys).toStrictEqual(filteredBosses);
+  expect(bossKeys).not.toContain<Boss>('theatreOfBloodHardMode');
+
+  expect.assertions(2);
 });
diff --git a/__tests__/lynxTitanStats.csv b/__tests__/lynxTitanStats.csv
index eeb1321..fb7dfd3 100644
--- a/__tests__/lynxTitanStats.csv
+++ b/__tests__/lynxTitanStats.csv
@@ -15,7 +15,7 @@
 3,99,200000000
 25,99,200000000
 5,99,200000000
-24,99,200000000
+23,99,200000000
 12,99,200000000
 2,99,200000000
 19,99,200000000
@@ -29,7 +29,8 @@
 -1,-1
 -1,-1
 -1,-1
-344430,22
+347584,22
+-1,-1
 -1,-1
 -1,-1
 -1,-1
diff --git a/src/hiscores.ts b/src/hiscores.ts
index 2b3ce0d..f4ecd90 100644
--- a/src/hiscores.ts
+++ b/src/hiscores.ts
@@ -68,7 +68,7 @@ export async function getRSNFormat(rsn: string): Promise<string> {
  * @param csv Raw CSV from the official OSRS API.
  * @returns Parsed stats object.
  */
-export function parseStats(csv: string): Stats {
+export function parseStats(csv: string, mode: Gamemode = 'main'): Stats {
   const splitCSV = csv
     .split('\n')
     .filter((entry) => !!entry)
@@ -97,11 +97,17 @@ export function parseStats(csv: string): Stats {
       return activity;
     });
 
+  /** `seasonal` API results don't currently include TOB: Hard Mode, so it needs to be filtered out in that case. */
+  const filteredBosses =
+    mode === 'seasonal'
+      ? BOSSES.filter((boss) => boss !== 'theatreOfBloodHardMode')
+      : BOSSES;
+
   const [leaguePoints] = activityObjects.splice(0, 1);
   const bhObjects = activityObjects.splice(0, BH_MODES.length);
   const clueObjects = activityObjects.splice(0, CLUES.length);
   const [lastManStanding, soulWarsZeal] = activityObjects.splice(0, 2);
-  const bossObjects = activityObjects.splice(0, BOSSES.length);
+  const bossObjects = activityObjects.splice(0, filteredBosses.length);
 
   const skills: Skills = skillObjects.reduce<Skills>((prev, curr, index) => {
     const newSkills = { ...prev };
@@ -123,7 +129,7 @@ export function parseStats(csv: string): Stats {
 
   const bosses: Bosses = bossObjects.reduce<Bosses>((prev, curr, index) => {
     const newBosses = { ...prev };
-    newBosses[BOSSES[index]] = curr;
+    newBosses[filteredBosses[index]] = curr;
     return newBosses;
   }, {} as Bosses);
 
@@ -250,7 +256,7 @@ export async function getStatsByGamemode(
   if (response.status !== 200) {
     throw Error('Player not found');
   }
-  const stats = parseStats(response.data);
+  const stats = parseStats(response.data, mode);
 
   return stats;
 }
diff --git a/tsconfig.json b/tsconfig.json
index ca4bf6a..cf7f094 100644
--- a/tsconfig.json
+++ b/tsconfig.json
@@ -4,7 +4,12 @@
     "module": "commonjs",
     "declaration": true,
     "outDir": "./lib",
-    "strict": true
+    "strict": true,
+    "lib": ["ES2015", "DOM", "DOM.Iterable"],
+    "typeRoots": [
+      "./node_modules/@types",
+      "./src/@types"
+    ]
   },
   "include": ["src"],
   "exclude": ["node_modules", "**/__tests__/*"]