As zed, This is the point of the game where Zed will have a lot of difficulty taking enemies down. This is because enemies will buy defensive items from now. Still, Zed should try to go for isolated targets when possible.

At level 16, he will have his Ultimate R maxed out. This means that he will deal massive amounts of damage to squishier targets and will decimate anyone who has been caught out alone/

Zed will have really low cooldowns now, and he can deal a lot of damage due to that. This means that he will be the bane of squishier targets on the enemy team, and he can get rid of them quickly. As zed, This is the point of the game where Zed will have a lot of difficulty in bringing down the enemies. That's because the enemies will buy defensive objects from now on. Yet, Zed should try to go for isolated targets when possible. At level 16, he will have his ultimate R maximd. This means that he will inflict massive amounts of damage to squishier targets and decimate anyone who has been caught alone / Zed will really have weak cooldowns now, and he can do a lot of damage because of that. This means that he will be the lot of squishier targets on the enemy team, and he can get rid of them quickly.