A Wizard who is within 3" of the tower at the start of the Magic phase gain the Loremaster special rule for that phase. If more than one Wizard is within 3", randomly choose which one has control of the tower at the start of each Magic phase.
Source: Warhammer Armies Project
A Wizard who is within 3" of the tower at the start of the Magic phase gain the Loremaster special rule for that phase. If more than one Wizard is within 3", randomly choose which one has control of the tower at the start of each Magic phase.