Survival of the Fittest

Survival of the Fittest is MU Online's ranked tournament series. It turns two event maps into competitions: Chaos Castle, a free-for-all where the last player alive wins, and Tormented Square, a hard team version of Devil Square. Results are ranked, the best move on to the next round, and the champions are written into the Hall of Fame on the website.

The older official page places the Chaos Castle tournament on the normal server, with the NPC Mait at (85, 135) in Lorencia Market. When Battle Core opened in February 2015, both tournaments moved there: you apply through Ellin, then speak to Mait in Loren Market inside Battle Core.

Any character of level 280 or higher can join; outlaws may be refused. The tournament runs during the first 6 days of every month and uses the normal Chaos Castle rules. Each game needs 5 to 70 players: entry stays open for 5 minutes, there is a 1-minute wait, and the fight lasts 10 minutes.

Every game is scored the same way: 1 point per monster, 2 per player and 3 for surviving to the end. Scores reset when you advance to the next stage. On equal points, the character with the lower level and less experience is placed first. The NPC's window shows rankings 1 to 50 for each stage, the schedule and a link to the Hall of Fame.

• During the rounds: a random 0 to 3 Jewel of Bless and 0 to 3 Jewel of Soul.
• In the final: Jewel of Life, Jewel of Creation and set items.
• The champion: a place in the Hall of Fame and the Wings of the Conqueror, a 28-day item that starts counting as soon as it is received.

A later reward renewal changed the champion's prize to a Conqueror's Badge, which the Chaos Goblin in Noria (180, 103) turns into the Wings of Conqueror. Monsters in the tournament drop a Present of Knights, and the Present of High Knights from the final has a better chance of holding a set item.

Tormented Square is an upgraded, much harder Devil Square for teams of 2. A match has 15 rounds of 2 minutes with 10 to 20-second breaks; rounds 5, 10 and 15 are boss stages, and 200 fierce monsters follow each boss stage. Monsters left at the end of a round disappear. Each round scores (monsters killed × hunting points) + (bonus points × surviving team members).

• Round 1 (4 days): 5 games a day, 20 in all; the top 2 teams of each game advance, up to 40 teams.
• Round 2 (2 days): 5 games a day; the winner of each game reaches the final, up to 10 teams.
• Final (1 day): a single game decides the champion team.

Teams that already advanced cannot play the earlier round again. A game needs 2 to 10 teams and will not start with only one, except in the final, where a lone team wins by default. Members can be swapped in round 1 only. To enter, the leader applies at Mait in Loren Market up to 5 minutes before the start, with both members present; the partner then accepts. Leaving the map means you cannot return.

Both champions receive a Badge of Hardships, which the Chaos Goblin in Noria combines into a Dark Transformation Ring with a 100% success rate. Monsters in the event drop a Devil's Box at random; the High Devil's Box has a better chance of giving a level 400 socket item. All rewards are collected on the normal server through Gremory Case, as explained in Battle Core.