Gear and Diablo 4 Items Itemization Updates
Season 9 introduces new Legendary items and rebalances existing ones to synergize with the Horadric system and altered class mechanics:

New Horadric Jewels: Passive items that grant bonuses tied to Arcana types, encouraging varied gear setups.

Legendary Items with Horadric Synergies: Items that specifically enhance Catalysts, Infusions, or Arcana modifiers.

Adjustments to Set Bonuses and Affixes: To balance power and promote build experimentation.

This retooling of gear impacts how players optimize their builds and choose their equipment.

4. Seasonal Mechanics and Affixes
The seasonal environment itself introduces new mechanics that influence gameplay:

Unique Seasonal Affixes that may affect enemy behavior or player stats.

Modified World Events and Bounties that reward using Horadric Powers or encourage certain combat styles.

Dynamic challenges designed to buy duriel mats test the versatility of new builds.

These seasonal elements create an evolving meta where adaptability is rewarded.