Someone found a
Old Tomb of a Nirvana Stage practitioner called Master of the Tomb in the Sky Flame Mountain near Yan City. This Nirvana Stage practitioner had set up an energy seal outside the old tomb. Only a few Advanced Manifestation Stage practitioners could break it. Inside some rooms are protected with force fields. 
It is mentioned that it also contains the
Extreme Yin Dragon Saliva and maybe a Nirvana Heart. Such an event created a lure that was strong enough to draw in even members of the Four Great Clans. The old tomb is extremely spacious, there were numerous complicated and intercrossing tunnels. 
There is also a main hall. This room is better defended and has also better resources. This room contained 6
There was also a room with the coffin of the Nirvana Stage practitioner. It contained the Nirvana Heart. In the coffin was a text inscribed. "During my life, I’ve advanced to the Nirvana stage through the power of Yin and Yang. What I’ve left behind requires Yin and Yang to understand. And if Yin and Yang do not come together, one would definitely be destroyed."
The Old Tomb is located in the Sky Flame Mountain near Yan City.
Seal on the tomb. Only a few Advanced Manifestation Stage practitioners could break it.
 Numerous complicated and intercrossing tunnels.
 Some rooms are protected with force fields.
 There was a Wooden Pole Formation around the room full of Symbol Puppets.
Twenty three thousand Pure Yuan Pills. 
 Hundreds of Demon Spirits.
 Six Soul Treasures.
One being incomplete (Mid grade)
 Lower and Middle Grade Symbol Puppets. 
 10+ Grade 6 Elixirs.
 Nirvana Heart.
Xuan Region, Chaotic Demon Sea, Demon Region
North Xuan Continent, East Xuan Continent, South Xuan Continent, West Xuan Continent
Dao Region, Yuan Region, Unique Devil Region, Heaven Sky Wind Sea Region, Sky Merchant Region, Illusionary Demon Sea Region, Sky Lightning Sea Region, Flame Sea Region, Beast War Region, Dragon Region, Mang Mountain Region, Western Sand Region
Great Yan Empire, Great Qing Empire, Saint Light Empire, Steel Empire, Hai Ling Empire, Iron Empire, Great Hidden Empire, Sea Scale Empire, Great Tang Empire, Xuan Yun Empire, Ling Yun Empire, Great Yuan Empire, Millennium Ice Empire, Great Crow Empire, Devil Cliff Empire, Black Cloud Empire, Devil Tiger Empire, Bestial Empire, Desert Empire, Prehistoric Empire, Death Valley Empire, Sky Eagle Empire, Corpse Empire, Great Song Empire, Sand Empire, Great Gan Empire, Wind Cloud Empire, Silver Wood Empire, Lone Moon Empire, Forest Empire, Lihuo Empire, Great Wei Empire, Great Net Empire, Celestial Empire, Sky Devil Empire, Tianyuan Empire, Divine Empire, Great Desolate Empire, Sword Empire, North Mountain Empire
Dayan Province, Great Desolate Province, Tiandu Province, Great Yan Province
Great Eagle City, Sky Fire City, Tiandu City, Yan City, Great Puppet City, Ghastly Puppet City, Lin City, Imperial City, Devil Cliff City, Demon City, Wanxiang City, Unique Devil City, Sky Merchant City, Blood Python City, Little Wasteland City, Darkness City
Sky Flame Mountain, Black Python Mountain, Mysterious Black Yin Mountain, Devil Cloud Mountain, Ice Devil Mountain, Sacred War Peak, Thunder Granite Mountain, Hundred Empire Mountain, Ten Thousand Beast Mountain, Demon Sound Mountain
Mysterious Objects Tower, Great Wastelands Ancient Tablet, Old Tomb, Ancient Treasure Trove
Nine Heavens Supreme Purity Palace, Dao Sect, Yuan Gate, Divine Sect, Symbol Valley, Blade Sect, Thousand Puppet Sect, Great Desolate Palace, Great Precipice Cave, Sword Sect, Ghost Blade Gate, Fire Cloud Sect
Mist Forest, Secret Cave(Rock Pool), Steel Wood Manor, Ancient Battlefield, Beast Valley, Blood Cliff Grounds, Burning Sky Ancient Stash, Demonic Beast Ancient Plains