Bubble

You touch a willing creature. For the duration, the target gains a Fly Speed of 30 feet and can hover. When the spell ends, the target falls if it is still aloft unless it can stop the fall. The bubble protects you from incoming damage providing a plus one to armor class. Non-magical attacks from within the bubble suffer a minus one on attack rolls.

Using a Higher-Level Spell Slot. You can target one additional creature for each spell slot level above 3.