Recently i dropped all my inventory after some creeper killed me from 1 hit exposion KO. After few minutes of searching for that place I found that my items were gone. I had some precious items like diamonds and now my steve is beggar.
So i came with this idea: after death of character every item from inventory would be placed in some kind of tombstone. That tombstone would work like a chest but after taking every item it would dissapear. This tombstone wouldn't spawn in lava, so every item after burning like this would end with losing every item.
There would be also possibility for adding items similiar to compas that would show place of that tombstone.
There are at least 3 gravestone mods that I know of, probably one or two more beyond that:
Gravestone -- adds a literal plank gravestone (think along the lines of the back of a chair just slammed into the ground) that you must break to get your stuff back. The items splash all over kind of like a vanilla death, so plan accordingly by bringing some blocks if you died in a dangerous or hard-to-reach area (like the void or in lava)
Tomb Many Graves -- similar to Gravestone, except there's no tombstone...it's just a dirt slab with your face on it. Sneak while standing on/adjacent to it, and all your stuff gets placed back in your inventory the way it was when you died. Any post-death items you grabbed or picked up will be dropped or possibly overwritten (I forget what it does, since I usually don't have to bring anything else).
Corail Tombstone -- this one I'm not sure about since it is a little bit more than just a gravestone mod, but I think this is the one that adds graveyard and tombstone structures you can raid for loot.
Better Gravestones? -- not sure what this one's called, only seen it once in a Hermitcraft server youtube series. When you die, your body is literally buried 6 feet deep (in other words, 2 blocks down) in an actual coffin. Opening it has a chance of spawning an undead version of yourself that chases after you, but otherwise I think it just chests your stuff and like a chest you have to manually pull it all out.