This item is acquired in-game. See its sources below.
A Poor Miscellaneous, item level 80.
First seen in build 12.0.7.68887 (Midnight (patch 12.0.7)).
Inert Runestone uses icon file 237477, which 35 other items also use. The 6 closest by item ID:
Flawed Lightbound Crystal ID 252021 · GemIntricate Lightbound Crystal ID 252020 · GemPristine Lightbound Crystal ID 252018 · GemPristine Felfire Crystal ID 252002 · GemIntricate Felfire Crystal ID 252000 · GemFlawed Felfire Crystal ID 251999 · GemBlizzard numbers items as they are created, so the named items next to ID 272894 (272444 to 272975) were usually added in the same batch as Inert Runestone: the same quest line, zone, vendor or reward set.
Small Decorative Dornogal Opal ID 272444
Decorative Dornogal Opal ID 272445
Large Decorative Dornogal Opal ID 272446
Shattered Gem ID 272892 · Miscellaneous · item level 80 "This dark stone feels surprisingly cold to the touch."
Icy Harness ID 272893 · Miscellaneous · item level 80 "The cold metal has a layer of frost on it."
Spring Panda ID 272920 · Miscellaneous · item level 10 "Teaches you how to summon this mount. This mount changes depending on your Riding skill and location."
Sunflicker Driftmoth ID 272956 · Miscellaneous "Teaches you how to summon and dismiss this companion."
Spellbreaker's Shieldwall ID 272960 · Armor - Shield
Spellbreaker's Bladestaff ID 272961 · Weapon - Staff
Hal'hadar Keeper Keycode ID 272975 · Quest "Free the caged creatures."The raw ItemSparse values for item 272894 in the current client build.
Read from the World of Warcraft client build files: Item, ItemSparse, Lock, Holidays, AreaTable and CollectableSourceVendor.
TheWoWDB