"Focus" spells are a new category of group spells that do not have a fixed duration. The spell will terminate when the caster dies or is sufficiently stunned. Group members who leave the group and the immediate room of the caster will lose the spell effect within approximately 60 seconds.
A caster can maintain only one focus spell at a time. However, a group of mentalists can provide one focus spell apiece, thus enabling the group to have multiple focus spells simultaneously.