Dusk Zone

A large smokey and shadow filled clouds appear from the casters feet in a 15ft radius. Hostile creatures that look at the caster can only see him/her hiding any allies within the range (allies however do not gain the benefits of invisibility). While this spell is up the creatures that try to attack you when you are the only one visible to them are at disadvantage. As well as, when a hostile creature is in your zone it acts as difficult terrain and deals 1d6 necrotic damage when they enter and end their turns in it. When a hostile creature is in the zone they only can see the creatures inside. If the caster is the only creature inside they have disadvantage when attacking him/her. When an ally attacks they attack normally and the hostile creatures can see them briefly before they attack (which is why they don't get surprised or seem invisible when attacking) but disappear from their sight right after. If an hostile creature moves within five feet of an ally they become visible to the attacking creature. When one of your allies leaves the spell effect a hostile creature within range is allowed to take a opportunity attack as an reaction as when leaving the zone you stumble out of it.