I think Nocturn's ult should be reworked
I think his currently ult is really simple and just...bleh.
His ult should really emphasize his whole shadow/darkness/nightmare theme. We would remove the semi global dash on his ult and increase his ult duration to 10 seconds. During the 10 seconds, Nocturn will envelop himself in darkness and become empowered. He'll gain movement speed and the ability to walk through walls(only when walking towards enemies). His abilities would all be empowered(Sorta like Shyv's ult).
All wards(or any vision giving ability, i.e teemo shroom) will become inactive. The minimap would not show where enemies are on the map. The one cool thing would be that you are not able to see what your ally sees. Your vision would be set to 600