Currently there are 6 native Macro Prime lenses for OM System OM-5 II and 5 of these lenses are autofocus (AF) type.
OM-5 Mark II also has a sensor based image stabilization system which means that all of these lenses will be stabilized when used on OM-5 Mark II.
Since OM System OM-5 II has environmental sealings (Weather Sealing), you may like to couple your camera with one of these 2 Macro Prime lenses with Weather Sealings.