We had a little problem last session. So here'sHere's the scenario: there are enemies in the area of a darknessdarkness spell that the PC has never seen but has heard. He casts the spell Slowslow on the area whichthat includes the monsters. Now my question
How is how this works exactly; are thesesituation adjudicated? Are the creatures in the area of darkness (which the caster of slow can't see through) affected by the slow spell or not because he doesn't have vision of them?