<http://schema.org/description>
"100% Hit Chance  A shadow falls across the battlefield, dealing 30 Humanoid damage and turning the weather to Darkness for 5 rounds.  During Darkness, all pets are considered Blinded and all healing received is reduced by 50%."^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.wowhead.com/pet-ability=256/call-darkness>