A unit's health is the amount of attack required to destroy a unit. It is also the amount of Chill required to prevent a unit from defending.
Most units heal from any attack they survive between turns. Fragile units are an exception as they do not heal. All damage they take permanently reduces their health.
Some green units, such as Asteri Cannon or Cryo Ray, use their own health as a resource. Clicking these units provides an effect in exchange for paying some amount of health. As a result, these units may only be clicked a limited number of times.
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