My idea here is for a bipolar defensive building. Making use of the skills employed by the Witch Doctor and the Priestess, a new dual-purpose tower was invented. The tower has two modes: Guardian mode gathers the power of the Witch Doctors and produces a shield that protects buildings within a radius (power/range increased by upgrade), reducing damage to them until it is destroyed. As a straight reduction, this will lessen the impact of large numbers of weak units, but heavy units will be less effected. The tower cannot protect itself. This gives rise to tactical attacks, where a player would have to consider how best to destroy the shield generator. In Nightshade mode, the enchantments of the Priestess become active, reducing/disabling the Magic Protection of Witch Doctors within the radius. Instead of protecting yourself, this strips enemy protection, weakening or preventing witch doctors from shielding or resurrecting troops nearby until the tower is destroyed. The player would choose which mode to set the tower in, and as it upgraded the radius/power would increase.