This is a guide to beating the Boss Hell House in the game Final Fantasy VII Rebirth (FF7R). This article explains Hell House’s attack patterns, weaknesses, and tips and strategies for defeating it on both Normal and Hard Mode.
How to Beat Hell House in Final Fantasy VII Rebirth (FF7)

Prepare Element Materia for all Elements
Since Hell House will change its weaknesses on the go, you’ll want to equip Fire, Lightning, Ice and Wind Materia on Cloud and Aerith beforehand.
Check the Windows to See Current Element
Hell House will use Barrier Shift to change its element and consequently its weakness. The color of its windows will let you know what element Hell House currently is, and it will use attacks based on what it element it is as well.
Using Aerith with her high Magic Attack stats, we managed to deal 1000 damage when hitting its weaknesses, so we recommend equipping her with as many different Magic materia as possible.
Make Full Use of the Wide Area
Most of Hell House’s attacks have many projectiles and cover a wide area, but you can avoid them if you run in larger circles, fully using the Colosseum space available.

Attack the Arms in God House Mode
While in God House Mode, as the name would suggest, Hell House will set up a barrier and make itself nearly invulnerable to physical attacks.
However, you can still attack its Arms and should definitely do so. You can keep using magic on Hell House itself to deal damage and try to Stagger it.