In MMOs, there is typically a mechanic that tanks rely on known as enmity, "aggro", or "threat", which is generated from damage and taunts. This makes monsters attack the tank. However, when fighting other players tanks will attempt to interrupt spell casters and apply debuffs, making them a high priority target for damage (as they are nullifying or mitigating the potential of the opposing team). Tank units are typically central to group play, and a large amount of responsibility is placed on them. A tank's death could cause the opposition to overrun the party, as they cannot cope with the magnitude of incoming damage.