Change #683d3eba716c87cdd312d0c7:

The wielder of the Dimensional Ballista gains the ability to to summmon the unit of the same name during war sessions, with strength and cost determined by era. This unit may be summoned regardless, and does not take up a unit slot if it's summon cost is used, otherwise it is free but takes up a slot. → The wielder of the Dimensional Ballista gains the ability to to summon a Siege Weapon unit of the current era. This unit gains the Magical tag. This unit may be summoned regardless, and does not take up a unit slot if a cost of 1 nation MP plus one per era is met, otherwise it is free but takes up a slot.