[Lazy_Perfectionist]

Well, Mathusalem... that oracle will be a bit flawed. The bless is nice, but with no recruitable earth mages, you may go without finding any earth gem producing sites. In that case, you'll have to convert astral pearls to earth gems for Gnome Lore. A decent rate of change, at least. And it is possible, though rare, that you'll cast a site search spell nine times without finding anything of that path.

As there are a few astral sites with earth gems, you may find some if you are patient. But in the early game, you can't depend on any earth income, especially being immobile. Also, if you have the appropriate neighbors, consider conquering the nearest earth-based nation, if you can. If they've found most of the sites for you, all the better. Of course, there is Acashic Record, but it is a bit pricey.

You may get lucky, but equally likely is that you'll be horribly pinched for earth gems in the early game. You can depend on it later in the game, though. Perhaps go for a dormant or imprisoned pretender. Spend those points on diversifying your bless. Air can make you even harder to hit by missiles, including those inevitable flaming arrows. Blood 4 will give +2 strength, which can help.