Part IV is here yay.
Khejistan: All Khejistan hidden side quests - PC General Discussion - Diablo IV Forums (blizzard.com)
Scosglen: Scosglen all drop item side quests - PC General Discussion - Diablo IV Forums (blizzard.com)
Dry Stepps: All Dry Steppes drop side quests - PC General Discussion - Diablo IV Forums (blizzard.com)
Fractured Peaks: All Fractured Peaks Hidden Side Quests - PC General Discussion - Diablo IV Forums (blizzard.com)
Gem-Laden Geode : Found in Hewezar from ore deposits.Should be any ore deposits in the entire zone, but I found mine in Umir Plateau.
Budding Crimson Thorn: I found this from Angel Breath in the Forsaken Coast. Likely to come from any herbs in the area though.
Timeworn Timue doll: Dropped loose stones in the south east coast of the Forsaken Coast.
Curious Venom: Dropped from snake enemies i nthe writhing mire.
Chained Zakarum Repository: Dropped from corpses in the dismal foothills.
Rusted Dagger: When leaving the tree of whispers way point, head directly south and your character should voice line. Druids go “what?” A ghost child appears and points west. Going west just past the altar of Lillith and the ghost child will point south east. Head south east to find the child body and loot the dagger.
Hungering Necrolyte’s Cache: Found off of slain corpses in Toxic Fens. Mot corpses seem to be in the south east part of the area. This drop can take a while.
The next set of quests must be done in a certain order. Also spoilerino.
Lyndon, the rogue mercenary from diablo 3, has a questline here in Hewezar, in Backwater to be precise. You must complete his side quests in order to get the following drops.
1.) Kingsport Ale - This will be a random drop from treasure chests in Rotspill Delta. All known reports are from chests located near the Belfrey Zakara dungeon. This item can take a very long time to drop for some people, while others get it immediately on the first chest. It took me over 25 chests to drop. I found mine here:
2.) Forgotten Crossbow - After turning in the ale, return to Rotspill Delta and loot corpses anywhere in the zone until you get the drop. This is another painful search. Utilize the entire zone because corpse respawns are annoyingly slow and teleporting or changing world tiers did not help me. I found mine here:
3.) Thieves Guild Emblem : After turning in the forgotten crossbow you can purchase the Emblem from the Jewel Crafter in Zarbinzet. Turn this in to Lyndon to complete his story.