The following is a reminder for me, and may perhaps serve as a checklist for others, in regards to anything I happen to deem worthy of note, pointedly organized on one page, by Act. This list mostly includes aesthetic items, though might include other notes.
Act 1[]
- Old Tristram Road>Whimsyshire; Sir William, drops Whimsy-themed portrait.
- The Old Ruins; Anvil of Fury, drops Griswold's Worn Edge. (Norm diff only)
- The Weeping Hollow; Ravi Lilywhite, drops pet Liv Moore.
- The Weeping Hollow>Den of the Fallen Level 2; Bishibosh's Remains, drops Wirt's Original Leg.
- Cemetery of the Forsaken>Development Hell; access to transmogs Incinerator and Rancor.
- Cathedral Level 1; within square room, Black Mushroom. (Norm diff only)
- Cathedral Level 2; Mysterious Chest, holding Templar's Chain.
- Drowned Temple; Mysterious Chest, holding Sungjae's Fury.
- Wortham; Urzel Mordreg, drops transmog Splintered Oar.
- Leoric's Manor; off the anteroom, in a fireplace, Leoric's Shinbone.
- Leoric's Manor>Royal Quarters; behind a hidden wall in the bedroom, transmog Lachdanan's Stormshield.
- Halls of Agony Level 3; Nevaz, drops transmog The Que-Hegan's Will.
- Halls of Agony Level 3>Chamber of Suffering; The Butcher, drops transmog Flail of Carnage.
Act 2[]
- Stinging Winds; Regreb the Slayer, drops transmog King Maker.
- Stinging Winds>The Lost Caravan; Graw the Herald, drops collectible Harvest.
- Dahlgur Oasis>Shrine of Rakanishu; upon destruction of the shrine, drops transmog Rakanishu's Blade.
- Dahlgur Oasis>Mysterious Cave; Mysterious Chest, drops Liquid Rainbow.
- Desolate Sands; Nine Toads, drops transmog The Clipper.
Act 3[]
- The Battlefields>The Barracks Level 2; Mysterious Barrel, holding transmog Mace of the Crows.
- Fields of Slaughter>Caverns of Frost Level 2; Chiltara, drops Gibbering Gemstone.
- Arreat Crater Level 1; Mysterious Chest, holding transmog Steffon's Heavy Lance.
- Ruins of Sescheron>Eternal Woods; Mysterious Chest, holding transmog Panther's Claw.
- Ruins of Sescheron>Immortal Throne; Mysterious Chest, holding transmog Kanai's Scorn. (during March only)
Act 4[]
- Gardens of Hope 1st Tier; Mysterious Chest, holding collectible Falcon's Wings.
- Gardens of Hope 1st Tier>Library of Fate; Rakanoth, drops transmog Hand of Despair.
- Gardens of Hope 2nd Tier; Mysterious Chest, holding transmog Ghoul King's Blade.
- Silver Spire Level 1>The Great Span; Izual, drops Plan: Staff of Herding.
Act 5[]
- The Survivors' Enclave>Zakarum Cathedral; Mysterious Chest, holding transmog God Butcher.
- Blood Marsh: Mysterious Chest, holding transmog Crossbow of Corvus.
- Greyhollow Island>Tidal Cave Level 1; The Succulent, drops transmog Helm of Cranial Crustacean.
Other[]
- Infernal Machine; 'Soul of Evil', drops transmog Star Pauldrons.
- Rift Guardian; Orlash, drops transmog Star Helm.
- Rift Guardian; Erethon, drops transmog Amberwing.
- Rift Guardian; Infernal Maiden, drops transmog The Reaper's Kiss.
- Rift Guardian; Lord of Bells, drops transmog Man Prodder.
- Anniversary Dungeon>Abandoned Farmstead; Wirt's Stash, holding pet Royal Calf. (during January only)