Cackling Skull

As you cast this spell, a shimmering skull will appear in your hands. As this spell only takes 1 action to cast, it does require 1 action to throw. After it is thrown, it begins cackling madly. All creatures hostile towards you or a creature you are friendly towards that you can see in the spell's area have disadvantage on all rolls. When the spell ends, the skull explodes and all creatures in its radius must succeed on a DC 13 Constitution saving throw or become infected with Cackle Fever. You are immune to Cackle Fever for the 24 hours after the spell has been cast.