So we have the three difficulty levels, but there should be a button that enables Hero Mode.
In Hero Mode, the health and damage of all enemies is set to Expert, plus one party member, and five additional risks happen.
1. Hearts no longer drop from fallen enemies. Heart Attack forces out Tier 1 hearts, and Heart boxes drop only one Capsule.
2. No more 'tells'. You see that colored aura that appears before an attack? Gone. Disabled. You need to look at your foe and read their next attack out.