Battle Core

Battle Core is an extra server where players from different servers gather to find out who is the strongest across all of them. It is divided into a Red section and a Blue section. Webzen opened it after the maintenance of 3 February 2015 (UTC), together with the first Survival of the Fittest tournaments.

You do not leave your home server to play it. After applying through the alert window at the top left of the screen or through the NPC Ellin in Loren Market (113, 132), you run a second game client, choose the Battle Core server and log in with the same account. Your character can keep hunting with MU Helper on the normal server in the meantime.

• Characters of any level may apply, but only 2 characters per account.
• You can apply once per day; changing your status otherwise has no limit.
• While applied, the character cannot trade, use storage or open a personal store on the normal server. Cancelling at Ellin restores this, but closes the game client.
• Cancelling keeps your Survival of the Fittest record and Battle Core progress; you continue from it when you apply again.

Applying starts Shadow Vision, a copy of your character that takes about 3 minutes to prepare. It brings your account and character name, stats, skills, buffs and the items you wear and carry, but not your storage, quests, friends list, helper settings or Zen.

• Every character receives 100,000,000 Zen.
• Trading, personal stores, MU Helper and the in-game shop are switched off.
• Buying, selling and repairing at NPCs costs 1 Zen.
• No 1:1 chat or mail; whispers work only between characters from the same server.
• You cannot create, join or leave a guild, or join or leave Gens, there.

Chaos Castle (Battle) is a daily event split by level bracket. Every NPC in Loren Market sells its ticket, the Guardsman's Armor Set; right-click it in your inventory at least 5 minutes before the start to apply. It follows the normal Chaos Castle rules: up to 70 players, 100 minus the number of players as monsters, and the last one standing wins.

Monsters drop a Guardsman's Box at random, and the winner gets one or more Guardsmen Commander's Boxes; the number depends on the bracket. Nobody is rewarded if no one survives. The reward boxes can contain Bless of Light, an extra EXP buff.

Battle Core also has a Chaos Castle (Normal) with the usual rules, where points add up from the server's opening to its reset and the top scorer gets a special prize:

This is a regular version of the Tormented Square tournament, made for Battle Core. You enter alone or in a party of up to 5 through the NPC Levine (128, 139); a party counts as one team and a solo player as a team of one. A match needs 3 to 20 players and has 6 rounds of 2 minutes. Normal monsters keep respawning, while 10 gold monsters appear once per round and are worth more points.

Points per monster go down as the team grows (one player 9,500 per kill, five players 3,500), but a full team that works well can still score more in total (17,500 against 9,500 in the official example). Only characters still alive at the end get the reward, an EXP Potion whose maximum grows with the number of teams. In rounds 3 and 6 the Chaos Goblin from Noria may show up: it has 255 HP, takes 1 damage per hit, sometimes teleports, and drops a Goblin Box for whoever lands the last hit.

Items won in Battle Core vanish from the inventory there when the event ends; you collect them on your normal server instead. In the later system, opening Gremory Case (K) on the normal server hands over everything you earned in Battle Core at once. Claim them before Battle Core resets. Survival of the Fittest prizes arrive the day after the finals, and the Battle Core schedule changes every month.