"After choosing the unit to be attacked, you may choose one of your units with boost icon Sk boost on it from your back row in the same column as the attacking unit, and rest it to make it boost the attacking unit (if it is a vanguard that is Legion, it will boost one of the attacking units under your choice). From this moment, the unit chosen becomes a "boosting unit" and the attacking unit becomes a "boosted unit" by that unit. The state of "boosting unit" and "boosted unit" only remains as long as both units continue present in their respective circles, until end of this battle.
Until end of the close step, while the boosting unit is in its original circle, its power value will continuously be added to the power of the boosted unit (even if its power is increased during the battle due to an effect). "
Pour faire cours, l'ajout du power de l'unit boosté est fait en permanent lors de la battle à partir du moment où elle boost. Donc si cette valeur vient à varier au cours de la battle (par un effet, trigger, etc) ou à disparaitre (unité retiré) et bien le boost change.