Season of Discovery players have noticed that damage is being reduced in Warsong Gulch against enemy players by 25%, which is an undocumented change that hasn't been mentioned in any Developer communications.
Players on the WoW Forums, Reddit, and elsewhere have been reporting the bug, but there hasn't been any communication on the change. While Blizzard did create three new helmets, Resilient Mail Coif, Resilient Cloth Headband, and Resilient Leather Mask, that 5% damage reduction is applied on top of the 25% damage reduction already present.
Image credit to Timetorun
Users have been documenting the damage differences and can see a consistent damage reduction applied to all players inside Warsong Gulch, while other users have reported findings that pet damage is not reduced. This would explain why Hunter Pets are so powerful in Warsong Gulch, even after the numerous Pet Tuning changes that have taken place.
While this change is likely a good thing, especially for the health of competitive Warsong Gulch, if the damage reduction isn't being applied to Hunter Pets, Warlock Pets, or Priest's new pets Homunculi, then that change should be corrected. As it is the Holiday season and Blizzard likely won't be around to make changes, we'll have to wait until early next year to see that fixed.
What do you think about flat damage reduction or items to reduce damage taken in Season of Discovery Warsong Gulch?