Let's make a list of any house rules to consider here. No judgement, just a list for the time being.

• The Core Mechanic is very similar to 5e

• Unique character generation rules specific to the Eldritch Earth setting

• Combat related rules and clarification

• A corruption system to track demonic possession

• A sanity system linked to morale and the corruption system

• Custom rules with regard to recruiting and retaing NPCs and Retainers

• An innovative but OSR-flavored rewards system

• A new spellcasting library that captures the flavors of Eldritch Earth

• A simple description of regular expenses and maintenance

• Directives for how to buy and maintain property and strongholds

• Rules for downtime crafting of mundane and magic items

• Information on how to request and carry out downtime side quests

• Details on how to use the “Western Marches” style campign