=Stinger=
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With a bit of luck, you can dig up the Grail even on level 113.
I placed a Tower on level 112, but my opponent didn't give up and almost managed to win.
Early excavations are quite rare, plus there are many drawbacks in terms of poor scouting, heroes standing still, and so on.
In short, digging for the Grail comes at the expense of exploring the map and maintaining momentum, and it's unclear which will yield more benefits.
By the way, there are password-protected save files; why not bring the Grail back into the game then?