Like your Crusade gear this is going to require a lot of resources in which you will need to be prioritizing to get these individual pieces crafted. However, you only really have to craft one piece of each gear item as they will refund your materials if you choose to switch to another piece. 

This set is unique in the sense that it will turn your into a part time STR Dark Lord and allow you a chance to ignite your opponent and deal up to 120% skill damage per second for 5 seconds and has a 60 second cooldown after it is done. 

Would be a great addition to any Elf, Dark Lord or Wizzard build.

The Earth set is going to be most players first choice for these sets because of its set bonus. When receiving Critical Hit Damage from another player (will happen all the time) you will gain a 30% chance of gaining a barrier equal to 20% of your Max HP. Like the other sets, this will last for 5 seconds which will be more than enough to dampen that incoming damage you are receiving and then goes into a 60 second cooldown

This seems to be specifically designed for all you Elf lovers. When attacking another player with Deadly Hit, you gain a 40% chance of inflicting off-guard (which is a damage amplification stat) on your opponent that will last for 3 seconds 

This is going to be a mini upgrade center for your sets. As you collect duplicate pieces of the same piece you currently have unlocked, you can them upgrade or amplify its stats by a certain margin. It will not be huge but since all the pieces are dropped at random you are bound to get a lot of duplicates.