Blue
Ravenous Bugblatter Beast of Traal
No one has actually died in my campaign yet. If they do, I was considering two houserules:
1) Every time you're resurrected you lose a point of Constitution.
Or
2) Instead of dying, you receive a permanent disfigurement and have to roleplay that in the future.
These were just ideas, i might not do them. My players would probably just roll up a new character and move on and not think too much about it. They're also not a huge fan of houserules unless something is agreed upon by the group to be problematic.
I would recommend talking about it with your players BEFORE it happens. A "hey, you just died and I've got a surprise house-rule to make it worse" could sour a player much more than "I want death to be meaningful so if it happens there will be additional permanent repercussions.".
And again, sometimes bad luck happens. I'd be worried about either (a) making the players too risk-adverse with their characters, or (b) incentivizing players to toss existing characters (and plotlines and backstory and relationships and ...) for new characters that don't have penalties.
If you want a higher price for lethality, maybe once per level raise dead works as expected (to account for a string of bad luck), but if you die again something more permanent happens.