Healer

The Healer is a flying unit. She has no attack abilities, but can rapidly heal any ground units, except when in defense (in which case she heals damaged buildings)

When the healer is deployed, a halo appears around her. If all units have full health, she will not do anything. Should a unit be hurt by a defense, she will fly over and start healing.

Note that Healers will not heal flying units (healers / Dragons / Balloons)

Strategy

 * Healers used to have almost no health.  That has been changed in recent patches.  All the same, Air Defenses should be destroyed or out of range before summoning one,otherwise they won't last long.
 * Healers can allow Giants and other defensive troops to withstand massive amounts of damage, even doubling that of their normal health.
 * If the Healer is donated as a clan reinforcement, she will heal buildings damaged by attackers.
 * Support the healer with durable troops like the giant or the P.E.K.K.A.