Hollow Knight - Nailsage Sly Boss Fight (Radiant Difficulty, Nail Only, No Damage)
Defeating Nailsage Sly on Radiant difficulty in the Hall of Gods for the Godmaster DLC. Radiant difficulty increases the boss health and some minor tweaks (Sly doesn't stagger for very long and moves a bit faster), plus you die in one hit. There are more opportunities to damage Sly if you're good at parrying, but I opted to play it safe.