Ashes and Rubble (Falcon & Winter Soldier, 3600 wds, Sam & Bucky & Zemo)
Zemo is poisoned with a hallucinogen while undercover with Sam and Bucky. This was for the tag prompt "Character Forced to Relive Their Worst Memory." Look, I have a brand.
Underground (Justified, 3200 wds, Rachel & Raylan & Tim)
An ill-advised attempt is made to pursue a suspect into a haunted mine. This is probably the most actually horror-ish of what I wrote, and can also be read without canon knowledge, I feel - all you really need to know is that they're US Marshals in Kentucky.
Katabasis (The Alienist, 8900 wds, gen or pre-OT3)
Set after season one, the characters try to fix a canonical character death using Flatliners-style methods. This is exactly as great an idea as it sounds like. This entry is also posted at https://sholio.dreamwidth.org/1412239.html with comments.