If you become fed towards late mid game then I would recommend you to sell wriggles for an atmas's impaler for the increased damage. Also if they team is ad heavy and their ap carry isnt that fed then you could also substitute the force of nature for a thornmail to have more sustain during team battles. P.S. Darius should be ready to gank as soon as he hits level 4 if you followed the skill sequences and should be double buffed when you do gank for the maximum gank potential(for the jungle build)

This is for the solo top build towards late game depending on how fed you are and they are you could go for a bloodthirster instead of atama's impaler if you need the exta damage and are already tanky enough. Once level three is reached Darius' 3 move combo should be enough to get you some early kills whether its 1v1 top or a 1v2 top.