Holy Command - Call for Aid

You can use thus command ability once per
battle when a friendly Redeemer unit with 5 or
fewer models is destroyed. If you do so, pick 1
Stormcast Eternals Hero on the battlefield. A
new replacement unit identical to the unit that
was destroyed is added to you army. Set up that
unit wholly within 12" of that Stormcast Eternals
Hero an more than 9" from all enemy units.
—
The holy power of Azyr heeds the call of Sigmar's
warriors and bolster their strength.