Hi, we realized that a lot of people would like to have more detailed information on which perks can appear on which types of items and from what point in the game on that is possible. So we created the following table to show that information publicly. First it is important to understand that most perks have a minimum item level that is needed for them to appear. When you upgrade an item with a level that is too low, they will not appear on the item, no matter how often you upgrade it. Also every perk can only appear on certain types of items (like Helmets or Capes etc.). Also some perks are “Uber Perks” and can only appear in the 2nd perk-slot, when an item has reached Uber-quality.
We also plan to have this information visible in the game in one of the next updates.