Prodigal Harbinger's Antechamber

Introduced in Shattering the Dark.

Creatures
Elemental:
 * Child of Artifice
 * Child of Enchantment
 * Child of Strife
 * Child of Verdancy
 * Harbinger
 * Pillar of Acid
 * Pillar of Fire
 * Pillar of Frost
 * Pillar of Lightning