Add Opacity spell by NEETzsche

spells.rb

@@ -17,6 +17,16 @@ class Spell
 									]
 		)
 
+        spells << Spell.new(
+            :name                  => "Opacity",
+            :matter                => 3,
+            :practice              => "Weaving",
+            :primary_factor        => "Duration",
+            :suggested_rote_skills => ["Science", "Stealth", "Subterfuge"],
+            :authors               => ["NEETzsche"],
+            :rules_text            => "The willworker can make transparent or translucent materials completely opaque. Air becomes completely impossible to see through, windows become solid colors, and bodies of water become too murky to see their non-aquatic contents. If the scale of this spell is an area of effect, any people inside of it suffer the Blinded Tilt."
+        )
+
 		spells << Spell.new(
 			:name                  => "It Takes One To Know One",
 			:death                 => 1,