Ambush

Choose any number of creatures that you can see within range. They each become invisible for the duration. If any creature affected by this spell moves, speaks, or takes an action or reaction, the spell ends for that creature, and at the end of that creature's next turn, the spell ends for all creatures that it is affecting. 

At Higher Levels. When you cast this spell using a spell slot of 4th or 5th level, you can maintain your concentration on the spell for up to 1 hour. When you use a spell slot of 6th or 7th level, you can maintain your concentration on the spell for up to 8 hours. When you use a spell slot of 8th level or higher, you can maintain your concentration on the spell for up to 24 hours.