Kez is a hero with two playing styles. Katana is great for laning stage to secure creeps. For this build, the maining style will be Katana. However, the items are still very good for Sai style. Player can still switch between style and take advantage. The key skill is grappling claws. The 6s cooldown with 100%+200hp lifesteal give you insane sustainability whenn you reach Lv7. Try to get kills with it even when you are low (often enemy make mistake).