This mod makes the health turn red whenever the player's total health is equal or below 225 (which is a one-shot kill from a heavy swat on Death Sentence.). It also takes damage reduction skills / perk decks in mind when calculating the one-shot health.

HUD	Compatible?	Notes
Vanilla	✅
VanillaHUD's CustomHUD	✅
MUI	✅
PocoHUD	✅
VoidUI	✅
Sora's HUD	✅	Both "thin" and "vanilla" health styles are supported.

Any HUD mod that keeps the vanilla circle should be compatible too, but feel free to let me know if any do not work with this. Using combinations of HUD mods may cause issues.

Health amount is configurable ingame via the options menu.

Idiosyncrasy had the original idea. I made it into a mod.

Want any HUD mod made compatible? Let me know in the mod's comments!