diff --git a/src/commands/ban.ts b/src/commands/ban.ts
index 82b6d98..b81ed34 100644
--- a/src/commands/ban.ts
+++ b/src/commands/ban.ts
@@ -1,6 +1,6 @@
-import { ApplicationIntegrationType, ChatInputCommandInteraction, Client, GuildMember, InteractionContextType, MessageMentions, PermissionFlagsBits, SlashCommandBuilder, time, TimestampStyles } from 'discord.js';
+import { ApplicationIntegrationType, ChatInputCommandInteraction, Client, Guild, GuildMember, InteractionContextType, MessageMentions, PermissionFlagsBits, SlashCommandBuilder, time, TimestampStyles, User } from 'discord.js';
 import { Database } from '../shared/Database';
-import { deferInteraction } from '../utils';
+import { AltData, comprehensiveAltLookupFromDiscord, deferInteraction } from '../utils';
 
 const mentionRegex = new RegExp(MessageMentions.UsersPattern);
 
@@ -50,6 +50,12 @@ export default {
         .setRequired(false)
         .setMinValue(0)
         .setMaxValue(7)
+    )
+    .addBooleanOption(option =>
+      option
+        .setName('full-ban')
+        .setDescription('Whether or not to prevent the user from joining on known alts (and ban all existing alts).')
+        .setRequired(false)
     ),
   handler: async function (client: Client, interaction: ChatInputCommandInteraction) {
     await deferInteraction(interaction);
@@ -74,6 +80,8 @@ export default {
 
     const deleteMessageDays = (interaction.options.getNumber('delete-message-days') ?? 0) * 86400;
 
+    const fullBan = interaction.options.getBoolean('full-ban') ?? false;
+
     let banMember: GuildMember | null = null;
 
     try {
@@ -94,11 +102,11 @@ export default {
 
     const expiresAt = new Date(Date.now() + duration);
 
-    if (duration > 0) await Database.putBan(idToUse, expiresAt);
+    await Database.putBan(idToUse, duration > 0 ? expiresAt : null, fullBan);
 
     try {
       await interaction.guild.bans.create(idToUse, {
-        reason: (reason + ` Banned by ${interaction.user.username} (${interaction.user.id})${duration > 0 ? `. Expires at: ${time(expiresAt, TimestampStyles.ShortDateTime)}` : ''}`).trim(),
+        reason: (reason + ` ${fullBan ? 'Full banned' : 'Banned'} by ${interaction.user.username} (${interaction.user.id})${duration > 0 ? `. Expires at: ${time(expiresAt, TimestampStyles.ShortDateTime)}` : ''}`).trim(),
         deleteMessageSeconds: deleteMessageDays
       });
     } catch (e) {
@@ -106,6 +114,31 @@ export default {
       return await interaction.editReply("Error banning user (couldn't ban).");
     }
 
-    await interaction.editReply(`<@${idToUse}> (${idToUse}) has been banned.`);
+    if (fullBan) {
+      const alts = await comprehensiveAltLookupFromDiscord(idToUse, interaction.guild);
+
+      await banAllAlts([alts], interaction.guild, interaction.user, fullBan, reason, deleteMessageDays, duration, expiresAt);
+    }
+
+    await interaction.editReply(`<@${idToUse}> (${idToUse}) has been ${fullBan ? 'full banned' : 'banned'}.`);
   }
-};
\ No newline at end of file
+};
+
+async function banAllAlts(altData: AltData[], guild: Guild, moderator: User, fullBan: boolean, reason: string, deleteMessageDays: number, duration: number, expiresAt: Date) {
+  for (const data of altData) {
+    if (data.type == 'discord') {
+      try {
+        if (!data.banned) {
+          await guild!.bans.create(data.thisId as string, {
+            reason: (reason + ` ${fullBan ? 'Full banned' : 'Banned'} by ${moderator.username} (${moderator.id})${duration > 0 ? `. Expires at: ${time(expiresAt, TimestampStyles.ShortDateTime)}` : ''}`).trim(),
+            deleteMessageSeconds: deleteMessageDays
+          });
+        }
+      } catch (e) {
+        console.error(e);
+      }
+    }
+
+    await banAllAlts(data.alts, guild, moderator, fullBan, reason, deleteMessageDays, duration, expiresAt);
+  }
+}
\ No newline at end of file
diff --git a/src/shared/Database.ts b/src/shared/Database.ts
index e57d933..0a0c578 100644
--- a/src/shared/Database.ts
+++ b/src/shared/Database.ts
@@ -79,7 +79,9 @@ const DB_SCHEMA = `
     CREATE TABLE IF NOT EXISTS bans (
       id INTEGER PRIMARY KEY,
       user_id TEXT,
-      expires_at datetime
+      expires INTEGER,
+      expires_at datetime,
+      full_ban INTEGER
     );
 
     CREATE TABLE IF NOT EXISTS github_user_mapping (
@@ -371,16 +373,20 @@ export class Database {
 
   // -- START BANS --
 
-  static async putBan(userId: string, expiresAt: Date) {
-    await Database.db.run('INSERT INTO bans(user_id, expires_at) VALUES (?, ?)', userId, expiresAt);
+  static async putBan(userId: string, expiresAt: Date | null, fullBan = false) {
+    await Database.db.run('INSERT INTO bans(user_id, expires, expires_at, full_ban) VALUES (?, ?, ?, ?)', userId, expiresAt != null ? 1 : 0, expiresAt, fullBan);
+  }
+
+  static async getBan(userId: string): Promise<Ban | undefined> {
+    return await Database.db.get('SELECT * from bans WHERE user_id = ? ORDER BY id DESC', userId);
   }
 
   static async getExpiredBans(date: Date): Promise<Ban[]> {
-    return await Database.db.all<Ban[]>('SELECT * from bans WHERE expires_at <= ?', date);
+    return await Database.db.all<Ban[]>('SELECT * from bans WHERE expires = 1 AND expires_at <= ?', date);
   }
 
   static async pruneExpiredBans(date: Date) {
-    await Database.db.all<Ban[]>('DELETE from bans WHERE expires_at <= ?', date);
+    await Database.db.all<Ban[]>('DELETE from bans WHERE expires = 1 AND expires_at <= ?', date);
   }
 
   static async removeBan(userId: string) {
diff --git a/src/types/database-types.d.ts b/src/types/database-types.d.ts
index 80986f6..48ff513 100644
--- a/src/types/database-types.d.ts
+++ b/src/types/database-types.d.ts
@@ -51,7 +51,9 @@ export type Note = {
 export type Ban = {
   id: number
   user_id: string
+  expires: 0 | 1
   expires_at: string
+  full_ban: 0 | 1
 }
 
 export type GithubUserMapping = {
diff --git a/src/utils/alt-utils.ts b/src/utils/alt-utils.ts
index 4196405..7b9c14b 100644
--- a/src/utils/alt-utils.ts
+++ b/src/utils/alt-utils.ts
@@ -3,7 +3,7 @@ import { Database } from '../shared/Database';
 import { userIsBanned } from './e621-utils';
 import { config } from '../config';
 
-type AltData = {
+export type AltData = {
   type: 'e621' | 'discord'
   thisId: number | string
   banned: boolean
@@ -52,15 +52,15 @@ export async function getDiscordAlts(e621Id: number, guild: Guild, depth = 1, ig
   return content;
 }
 
-export async function comprehensiveAltLookupFromDiscord(discordId: string, guild: Guild): Promise<AltData> {
+export async function comprehensiveAltLookupFromDiscord(discordId: string, guild: Guild | null): Promise<AltData> {
   return getE621AltData(discordId, guild);
 }
 
-export async function comprehensiveAltLookupFromE621(e621Id: number, guild: Guild): Promise<AltData> {
+export async function comprehensiveAltLookupFromE621(e621Id: number, guild: Guild | null): Promise<AltData> {
   return getDiscordAltData(e621Id, guild);
 }
 
-async function getE621AltData(discordId: string, guild: Guild, depth = 1, ignore: number[] = []): Promise<AltData> {
+async function getE621AltData(discordId: string, guild: Guild | null, depth = 1, ignore: number[] = []): Promise<AltData> {
   const e621UserIds = await Database.getE621Ids(discordId);
 
   const toIgnore = ignore.concat(e621UserIds);
@@ -69,7 +69,7 @@ async function getE621AltData(discordId: string, guild: Guild, depth = 1, ignore
 
   // It's either this or fetch all the bans and sift through them for every discord alt.
   try {
-    banned = !!(await guild.bans.fetch(discordId));
+    banned = guild ? !!(await guild.bans.fetch(discordId)) : false;
   } catch (e) { }
 
   const data: AltData = { type: 'discord', thisId: discordId, banned, alts: [] };
@@ -83,7 +83,7 @@ async function getE621AltData(discordId: string, guild: Guild, depth = 1, ignore
   return data;
 }
 
-async function getDiscordAltData(e621Id: number, guild: Guild, depth = 1, ignore: number[] = []): Promise<AltData> {
+async function getDiscordAltData(e621Id: number, guild: Guild | null, depth = 1, ignore: number[] = []): Promise<AltData> {
   const discordIds = await Database.getDiscordIds(e621Id);
 
   const data: AltData = { type: 'e621', thisId: e621Id, banned: await userIsBanned(e621Id), alts: [] };
diff --git a/src/webserver/index.ts b/src/webserver/index.ts
index 84072b2..0b62c5c 100644
--- a/src/webserver/index.ts
+++ b/src/webserver/index.ts
@@ -11,6 +11,7 @@ import { Client } from 'discord.js';
 import bodyParser from 'body-parser';
 import { fixPings } from '../utils/github-user-utils';
 import { logDebug } from '../utils/debug-utils';
+import { AltData, comprehensiveAltLookupFromE621 } from '../utils';
 
 declare module 'express-session' {
   interface SessionData {
@@ -33,33 +34,51 @@ const oauth = new DiscordOAuth2({
   credentials: Buffer.from(`${config.DISCORD_CLIENT_ID!}:${config.DISCORD_CLIENT_SECRET!}`).toString('base64')
 });
 
-async function joinGuild(code: string, userId: string, username: string) {
-  if (Number.isNaN(userId)) return false;
-  if (!username) return false;
+const enum JoinResponse {
+  Success = 1,
+  Error = 2,
+  Banned = 3
+};
 
-  const id = Number(userId);
+async function joinGuild(code: string, userId: string, username: string): Promise<JoinResponse> {
+  let tokenResponse;
+  try {
+    if (Number.isNaN(userId)) return JoinResponse.Error;
+    if (!username) return JoinResponse.Error;
 
-  const tokenResponse = await oauth.tokenRequest({
-    code,
-    scope: 'identify guilds.join',
-    grantType: 'authorization_code'
-  });
+    const id = Number(userId);
 
-  const user = await oauth.getUser(tokenResponse.access_token);
+    tokenResponse = await oauth.tokenRequest({
+      code,
+      scope: 'identify guilds.join',
+      grantType: 'authorization_code'
+    });
 
-  await Database.putUser(id, user);
+    const user = await oauth.getUser(tokenResponse.access_token);
 
-  await oauth.addMember({
-    accessToken: tokenResponse.access_token,
-    botToken: config.DISCORD_TOKEN!,
-    guildId: config.DISCORD_GUILD_ID!,
-    userId: user.id,
-    nickname: username
-  });
+    await Database.putUser(id, user);
 
-  await oauth.revokeToken(tokenResponse.access_token);
+    const alts = await comprehensiveAltLookupFromE621(id, null);
 
-  return true;
+    if (await checkAltsForFullBans([alts])) return JoinResponse.Banned;
+
+    await oauth.addMember({
+      accessToken: tokenResponse.access_token,
+      botToken: config.DISCORD_TOKEN!,
+      guildId: config.DISCORD_GUILD_ID!,
+      userId: user.id,
+      nickname: username
+    });
+  } catch (e: any) {
+    if (e.code == 40007) return JoinResponse.Banned;
+    console.error(`Error joining user (${userId}) to discord:`);
+    console.error(e);
+    return JoinResponse.Error;
+  } finally {
+    if (tokenResponse) await oauth.revokeToken(tokenResponse.access_token);
+  }
+
+  return JoinResponse.Success;
 }
 
 async function handleInitial(req: Request, res: Response): Promise<any> {
@@ -124,9 +143,12 @@ async function handleCallback(req: Request, res: Response): Promise<any> {
   });
 
   try {
-    if (!await joinGuild(code, userId, username)) {
+    const response = await joinGuild(code, userId, username);
+    if (response == JoinResponse.Error) {
       console.error(`Error joining user: ${username} (${userId})`);
       return sendInteralServerError(res, 'Unable to join user to guild.');
+    } else if (response == JoinResponse.Banned) {
+      return sendForbidden(res, 'User is banned.');
     }
   } catch (e) {
     console.error(e);
@@ -211,6 +233,23 @@ async function handleGithubRelease(client: Client, req: Request, res: Response):
   logDebug('Github webhook processed');
 }
 
+async function checkAltsForFullBans(altData: AltData[]): Promise<boolean> {
+  for (const data of altData) {
+    if (data.type == 'discord') {
+      try {
+        const banData = await Database.getBan(data.thisId as string);
+        if (banData?.full_ban) return true;
+      } catch (e) {
+        console.error(e);
+      }
+    }
+
+    if (await checkAltsForFullBans(data.alts)) return true;
+  }
+
+  return false;
+}
+
 export function initializeWebserver(client: Client) {
   const app = express();