Diablo 3 patch 2.4.0: new expanded zone: Royal Quarters of Leroic's Manor
This new zone in Leroic's Manor was added in 2.4. You can find hints for the location of 2.4 set dungeons in the library area (3:28) (though it is not necessary to get the hints to enter the set dungeon). There is also a hidden room (3:54) where you can find a special shield (Lachdannan's Stormshield) which can be used for transmog. (Interesting point: the Lachdannan's Stormshield looks exactly like Diablo 2 version Stormshield!)
From patchnotes:
"The cultists have finally gotten around to clearing up the debris on those stairs in Leoric's Manor, opening up the Royal Quarters for curious treasure hunters."
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