To complete "A Healer's Mercy" in Phantom Blade Zero, you must find four lost thieves in the Crimson Forest, the second region. As none of them are waiting on the main path, it's quite a hassle to distribute Yu'er's medicine and get the thieves back to thieving. Here's where to find the four wounded thieves and complete "A Healer's Mercy" in Phantom Blade Zero.
"A Healer's Mercy" starts when you meet Yu'er at the Thieves' Camp. This is her third location (the previous one being the Outpost in Weeping Creek Valley). Yu'er should be there on your first visit.
You'll find the Thieves' Camp about halfway through the Crimson Forest, shortly after defeating Jing Ye, The Outlaw. Yu'er wants you to find the four wounded men and give them her medicine. Based on their locations described in the Record of the Lost Thieves, here's how to find them quickly.
This lost thief is the easiest to find. Teleport to the Outlaw Trap bell, then enter the cave to the west. You'll find Li just behind the blue flowers.
Starting at the Outlaw Trap bell again, you must obtain the Crimson Forest Tunnel Crank, which is at the end of the nearby cave system, just behind Li the Flying Rat's location described above. Return to the Outlaw Trap bell and slot the Crimson Forest Tunnel Crank into the stone mechanism to open the hatch. Drop down, descend the ladder, turn right, and take the path left behind the table, where you'll find Zhou.
Starting at the Thieves' Camp, take the path to the northwest. Stick to the main road, and you'll pass the Red Serpent House and the Cliff of Longing before arriving at the Cliffside Lodge. Enter the Lodge's basement, and look for the orange glowing item, the Thieves' Camp Dungeon Key.
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