SCE Call for Aid

You can use this 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 your army. Set up that unit wholly
within 12" of that STORMCAST ETERNALS
HERO and more than 9" from all enemy units.