The Exida is a long-range unit exclusive to the Cymanti tribe that poisons enemy units in a splash area attack. The Exida deals primary damage to only the targeted unit, but it poisons all adjacent units. This makes it well-suited for attacking groups of enemy units.
The Exida is unlocked by the Mathematics technology and replaces the Catapult. The Exida has more defence but does less damage in its primary attack. It shares many of the Catapult's weaknesses, like slow movement and need for protection from other units.