General
The Trench Doctor's guilt has become the toy of some aberrant spirit. Relentless and mocking, the specter has grown bored of idle mutterings, and now it seeks to make the Doctor's self-loathing manifest:
-The Deserter, this sadistic ghost will focus on breaking the mind of the Trench Doctor. It's mere presence, however, will also improve the healing abilities of its puppet.
-The Red Grim, malevolence has twisted the form of this ghoul, empowering its skills, and allowing it to heal from the flesh it rends.


Specific
How to trigger: Upon getting hit below 40% HP, the Trench Doctor may contract his exclusive disease, PTSD. The disease serves as the trigger for the first fight.

Winning the fight will reward you with the key item, Ruined Paper. Using this item on the Doctor will evolve PTSD to the next stage, allowing you to progress the quest. (I opted to give multiple copies of the key item in case you mash through menus like me.)

Winning the second fight will reward you with the next key item, Filed Report. Using this item will evolve PTSD to its final stage. Defeating the miniboss at this stage is guaranteed to give 3 Medical Studies.

Note: Only spawns in Hallway tiles, and should trigger in any dungeon, vanilla or modded.
Note: Has a 10% Chance to spawn.
Note: Each difficulty also includes trigger for preceding battle. (i.e. If you don't get PTSD until Resolve 6, you can encounter all 3 fights in Champion dungeons.)