Recipe: 275 stone
-2 colour variation
-base colour of the stone
-trim around the engraving
5,000 character limit
(Totally don't want to abuse this to spam the unibomber manifesto. Nope, not at all.

Decays slow as fuck. Needs to last longer than decaying villages as they'll serve as a great memento of what was once there.
Reasons this is a good idea:
1. Aesthetic
2. We've no books for me to mass produce low quality erotica & other nonsensical things to shove into their cupboards. Thus this is the second best option.
3. Gives you more space to partake in dick waving contests.
4. 5,000 characters is a lot. Imagine all the nice things people will write on them.
5. The player population might tank harder than the 2 towers on 9/11 but the giant runestones celebrating dick inspection day shall remain long after we all leave.
And that's why we need thick runestones.