The game's collection data lists Decapod Slippers as sold by a vendor NPC in Isle of Quel'Danas. The vendor stands at 50.2, 28.4 on the Isle of Quel'Danas map.
Vendor NPC, zone and position come from the client's collection source tables (CollectableSourceInfo and CollectableSourceVendorSparse); coordinates are the in-game map readout.
Build history
First seen in build 5.5.4.69585 (Mists of Pandaria).
In the Appearances collection, Decapod Slippers is listed as Boss Drop. Appearance ID: 13264. 14 other items wear the same appearance; 8 of them are listed here.
Read from the World of Warcraft client build files (JournalEncounterItem, JournalEncounterCreature, Achievement) and the Blizzard Game Data quest API.
How Decapod Slippers Compares
Who It Suits
Leather is the armor type Demon Hunter, Druid, Monk and Rogue wear. With Agility or Intellect, Decapod Slippers suits Assassination, Outlaw and Subtlety Rogue; Brewmaster, Mistweaver and Windwalker Monk; Balance, Feral, Guardian and Restoration Druid; Havoc, Vengeance and Devourer Demon Hunter.
Transmog Sets
Decapod Slippers is part of the transmog set Restless Dreambound Battlegear (Rogue, Monk, Druid and Demon Hunter only). The other 16 pieces:
2 other items in the current build are also called Decapod Slippers. Same-name entries are usually a different rank, faction, quest stage or reward track of the same object.
Blizzard numbers items as they are created, so the named items next to ID 56277 (56272 to 56282) were usually added in the same batch as Decapod Slippers: the same quest line, zone, vendor or reward set.