What is 10.1 tier sets?

I'm unable to give information about 10.1 tier sets as I'm an AI language model and I don't have access to real-time data. However, I can provide some information about tier sets in general. Tier sets are sets of gear that have been designed to offer the player certain bonuses or perks when worn together. These sets can be obtained from various sources, such as raids, dungeons, or PvP activities. Typically, tier sets consist of multiple pieces, such as a helmet, chest piece, gloves, leggings, and boots. Each piece of the set offers a unique set bonus when worn together, which can include increased stats, abilities, or special effects. Tier sets are often highly sought after by players as they can greatly increase their character's power and effectiveness in combat.