Frenzy Field

A Frenzy Field, sometimes referred to as a Fever Field (Korean: 피버 필드 , literally "Fever Field") is a special type of map location present in Zero and Transcendence. This map system does not exist in Renewal.

A Fever Field will spawn Champion monsters after a certain number of normal monsters are defeated, and will spawn Boss monsters after a certain number of Champion monsters are defeated. These monsters can drop equipment with special random options not available from the drops of regular monsters.

Transcendence mentions 10 normal monsters specifically to spawn a Champion.

A portal leading to an active Fever Field map will have a different colour.

Clock Tower Dungeon
When a certain number of specific monsters are killed, an intermediate boss will spawn corresponding to that monster.

Glast Heim Dungeon
Glast Heim has 4 Fever Dungeon maps with slightly different mechanics.

Staircase
 * Some monsters belong to a specific faction.
 * Slaying monsters mainly of one faction will have an effect on the opposing faction.

Chivalry
 * Floor 1 is a normal field, floor 2 is a Fever Dungeon.
 * The Boss monster's stats will be altered depending on which normal monster was slayed the most to spawn it.

Prison
 * The Boss monster's stats will be altered depending on which normal monster was slayed the most to spawn it.

Cavern
 * This map only becomes a Fever Dungeon for a period of time after enough monsters are slayed.

Nogg Road Dungeon
Floor 3 only. BaseLv must be 75 or higher to enter.