[licker]

Flame arrows is enchantment 3 or 4, costs 1 fire gem and requires a F3 mage to cast. Its a turn 10 spell if you go for it from the start. Staves of Storms are easilly turn 15 items for nations that rush to them...

I've not tinkered much with aim or eagle eyes on archers, I'm sure it helps, but with that many archers it may be less effective as you are counting on saturation fire anyway. There are other air spells (wind guide for one) that help all your units precision stats, though if you don't have air mages I'd not worry about those too much.