This item is acquired in-game. See its sources below.
A Rare Miscellaneous, item level 1, binds when picked up.
First seen in build 12.0.7.68887 (Midnight (patch 12.0.7)).
The client names Niblet as the reward of 1 achievement.
Read from the World of Warcraft client build files (JournalEncounterItem, JournalEncounterCreature, Achievement) and the Blizzard Game Data quest API.
Blizzard numbers items as they are created, so the named items next to ID 240840 (240828 to 240859) were usually added in the same batch as Niblet: the same quest line, zone, vendor or reward set.
Shrinebreaker's Greaves ID 240828 · Armor - Mail · item level 13
Shrinebreaker's Wristguards ID 240829 · Armor - Mail · item level 13
Shrinebreaker's Grips ID 240830 · Armor - Mail · item level 13
Hieron's Journal ID 240831 · Quest "A battered journal carried by Riftwalker Hieron."
Twilight's Blade Missive ID 240838 · Quest "Crucial information about the Twilight's Blade, penned in a cryptic hand."
Quick Peridot ID 240855 · Gem · item level 278Quick Peridot ID 240856 · Gem · item level 295
Deadly Peridot ID 240857 · Gem · item level 278Deadly Peridot ID 240858 · Gem · item level 295
Masterful Peridot ID 240859 · Gem · item level 278The raw ItemSparse values for item 240840 in the current client build.
Read from the World of Warcraft client build files: Item, ItemSparse, Lock, Holidays, AreaTable and CollectableSourceVendor.
TheWoWDB