Creep focus? You have to be more specific. Units like zombie and poison spiders will switch targets for each attack in order to maximize the number of infected enemies. If you mean the switched targeting the lane bosses do, it's based on how strong the enemy is - namely max hp. Should your current hp be very low you can still find yourself targeted.
Blacksmith items have already been brought up. Take a look around, you'll find all listed items in this forum.Added (2017-02-26, 5:05 PM)
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Naturally we cannot share unlisted items. You'll have to unlock those for yourself.