Hard difficulty uses the same design as the normal ID route, scenery, bosses, and MOBs.
However, additional patrolling mobs will be installed along the way, and the damage from mobs will be very painful, and the values ​​will be changed so that tank reduction and healer burdens are very heavy.
Also, the boss gimmick is the same as normal, but some invisible attacks and random targets are added.

With something like this, wouldn't it be fun for both tanks and healers?
Also, on Hard difficulty, there are more token rewards than normal, and how about adding individual treasure chests with materials to strengthen normal ID equipment? (Like the Judge Order Armor series, you collect materials and strengthen them into RE armor.) RE armor can give you 3 materia, but if that upsets the balance, how about the SP that was in the 50lv production armor? Some effects have been added to lv50SP armor.
Akatsuki (6.x)'s raid armor is a new attempt, with effects unique to the armor added.
What about something like that?

Wouldn't it be possible for casual players to practice on a normal level and become more motivated to take on a hard challenge?