ToME: the Tales of Maj'Eyal

In most open source games, there's that one really big addon that everybody knows of. Once you play through the original game a couple times you play through this really big addon that changes "everything". Is there any huge overhaul addon or something like that for TOME?

...Not really?

We have a few, but they aren't exclusive, totally game-changing, or ubiquitous.

That being said... Why not take a stab at it?