Surround your prey with conjured Illusion units 

The Spectral Conclave are a secret society that have long honed their skills in illusory magic. From out of thin air, their summoner Feyrin calls the ghostly forms of strange beasts into being. These illusions strike at their enemies and then dissipate back into the ether. Confound your enemies as you assault them with your nearly limitless supply of spectral units!

—description from the publisher