This will start with Normal and Heroic Difficulties and will put an emphasis on fans collecting that new corrupted gear.
“Turn N’Zoth’s dark power against him by seeking out weapons and armor tainted with Corruption, a new addition to items that provides powerful boons—with potentially deadly consequences. Seek out measures to counter these effects, or embrace its power and learn to endure the madness,” a message from Blizzard explains.
“Cursed by N’Zoth, corrupted items offer truly exceptional power—for a price. As you don more corrupted gear, you’ll find your spells will do more damage, or your heals will be more potent—but the Corruption will begin to affect you in increasingly perilous ways.
“At low Corruption levels, you may be slowed periodically when taking damage—while at higher corruption levels, evil forces from the Void may come for you at any moment.
“Deciding how much Corruption to take on is a delicate balancing act, but Corruption can be mitigated with your new legendary cloak and all new Essences. By equipping this gear, you can negate some of the corruption and reap the benefits of N’Zoth’s might with fewer downsides.”