Army of Shadow

Master, Shadow Calling
Level/School: 9th/Conjuration (Summoning)
Range: Close (25 ft. + 5 ft./2 levels)
Effect: One summoned creature
Duration: 1 minute/ level

Reality seems to tear open, revealing a dark rift. From the blackness, a shadow elemental emerges.

This mystery functions like the spell summon monster I, except as noted here. You can summon one Elder shadow elemental.