Change quest to Legacy of Cain - "explore adria's basement".
Take waypoint to old ruins. Run to the hut (~15 seconds). Go inside the basement, get a champion skeleton to spawn + bonus potions inside cauldron.
There is also around 30% chance for a chest to spawn inside too.
Sometimes there is also a chest right outside the hut, which you can grab after you exit the cellar after the event.
Talk to Leah for 16.5k exp quest turn in, then teleport, and repeat.
Works like a charm for me, 2-3 blues per run with no MF gear.
There is also sometimes a small "keepsakes box" near the waypoint, that can give you the missing lore pieces for achies etc.
https://i.imgur.com/yENa6.jpg <- Keepsakes box
https://i.imgur.com/CbHXL.jpg <- Chest outside
https://i.imgur.com/whFn6.jpg <- Chest inside