With the launch of Season of Discovery Patch 1.15.3With the launch of Season of Discovery Patch 1.15.3, eagle-eyed players have noticed a change to Thunderfury, Blessed Blade of the Windseeker — it's gotten significantly smaller.
Thunderfury, Blessed Blade of the Windseeker is an iconic Legendary in World of Warcraft with a famously large model. However according to posters on Reddit, it has been altered from the traditional large Classic model to the smaller Cataclysm model.
Whether this change has been intended or is a bug remains to be seen.
Thunderfury Thread on Reddit
Larger Classic Model on Left, Cataclysm Model on right; image provided by Key_Adhesiveness9729 on Reddit
Many players have expressed dissatisfaction with the size change, requesting that the old model be brought back. Players even cited a long-ago adjustment to the size of Shoulder armor that was reverted due to player outcry, likening the two situations.
This isn't the only change that has been found so far on Classic Era realms since the Season of Discovery Patch 1.15.3 launched.