Super Chests are Chests that appear in certain specific areas, like after Mephisto in Durance of Hate level 3 or like we have here in the Lower Kurast huts by the campfire. They have a different dropping system from Monsters, regular Chests, or Sparkling Chests. These chests have a limited number of dropping possibilities and patterns, more exactly 65536 different ones. Every time you hit a Super Chest you will get one of the 65536 possible combinations of drops. Some of the patterns contain a high-tier Rune such as Vex, Ohm, Lo, Sur or Ber Rune so that is one of the main hopes you are aiming for when opening them! Additionally, Magic Find percentage does not have any effect on Super Chests so you can gear toward simply being as fast as possible.