To make a character's health tangible, Fantasy OS utilizes Health Points (HP). Whenever a character takes damage, whether from poison or a sword strike, their HP decreases. If they drop to 0, the character is dying.

Each character starts at Level 1 with 10 HP, and if positive adds their CON to it. For each Level above 1, they gain 5 and may again add their CON to it.

While it has no direct impact on gameplay, one can imagine a character with low HP as suffering from pain, bleeding in multiple places, and being exhausted.