Fortitude is a Support Skill in Octopath Traveler.
Damage goes up as HP goes down
{ "id": "fortitude", "type": "SupportSkill", "data": { "name": "Fortitude", "description": "Damage goes up as HP goes down", "SupportSkill-JOB": { "fortitude__SupportSkill-JOB__warmaster": true }, "skills_needed": 6 }, "updatedAt": 1710802402385 }