[PvK]

Hahr!

Um, well 5000 on turn 1 sounds a bit hard. You can at least give yourself whatever starting sites are best for this, by looking at the site list someone made, and taking those.

Then you could pick Global Enchantments which require a lot of gems, and mod the spells so they are easy-to-cast national spells of your nation.

You might be able to do a map mod where your provinces are given commanders loaded to the brim with gems and gem-generating items. Maybe create monsters which generate gems - that might do it in one shot, except they'd probably go into the unit's personal supply, which has a limit.

Sounds like a pain. Why do you want 5000 gems?

PvK