Mages since ancient times have perfected these spells, it's advised to make use of these at all times.
While strong, the reach of these spells is limited to your own tribe.
Your mage is able to influence not only the citizens of your tribe, but cast a spell on a god as well. Elendian is the God of love and fertility. Your mage casts a spell convincing the God to increase your max population for a few months.
In the valleys of Orkfia a river runs. All tribes go to the river and drink of its water, but they also go there to relax. The calming sound of the river and the soothing echoes makes them more fertile. Casting the spell inclines your citizens to go down to the river and mate.
By casting this spell the Lord of Harvest will bless your lands and make them more productive and rich in growth.
Quanta is the God of wealth. When your mage casts this spell, it convinces Quanta to bless your peasants in the trade business.