Faerie fire

Each object in a 20-foot cube within range is
outlined in blue, green, or violet light (your
choice). Any creature in the area when the
spell is cast is also outlined in light if it fails
a Dexterity saving throw. For the duration,
objects and affected creatures shed dim light
in a 10-foot radius. Any attack roll against
an affected creature or object has advantage
if the attacker can see it, and the affected
creature or object can't benefit from being
invisible.