Death in the game Kensei Online, defined as having zero health points, will cause players to die in real life. Because of this, the players often create unofficial rules to allow the greatest chance of a player surviving battles. Players can die from numerous methods, including but not limited to damage from monsters, player-killing, or falling a great distance.

When a player dies, his body gradually fades from sight. The only reliable method of knowing whether a player has died in the game is to find the deceased player's tombstone at the Garden of Memories.