Balanced Minecraft Hardcore (BMH) gives you flexibility in difficulty by replacing death by distant respawn based on your difficulty and Eternal Items possessed.
Eternal items stay with even after you die, but lose some durability. They are very powerful items and you can only carry one type at a time.
No coordinates, it means that you have to craft some special items to know where to go.
Sleeping is now slightly revamped, it can give you a buff if you sleep well but you loose some food when waking up.
You can take a look at this project on the dedicated Github page here and join me on my Discord.
