A split skill is a skill that, when acquired, exists as two different versions, depending on the player's environment (PvE or PvP). The update on May 22nd, 2008 introduced PvP versions for some skills. The game replaces the PvE version with the PvP version on the player and his/her heroes whenever the player travels from a PvE area to a PvP area (such as the Guild Hall) and vice versa. A note of this is written to the chat log whenever it occurs, listing the skills and heroes concerned. In addition, the PvP effect is shown in the player's effect monitor when they are in a PvP outpost or in their Guild Hall.