This is a lost spell, and cannot be researched unless your nation has been granted access to it.
Conjuring Ways
Average
510
The character is at a population centre of their own nation, or
The character is with an army or navy
No information is required, but you may enter the number of food to be conjured. If omitted, then your mage will conjure the maximum that he or she is able, so omission is a sure way of not miscalculating.
Conjure up to 25 units of food per point of natural mage rank they possess. The character must be at a population centre belonging to their own nation, or with an army or navy. If the number of food to be conjured is not specified, or is given as zero, the maximum possible will be conjured. If the character is with an army or navy the food is added to the army or navy; if not, it is added to the population centres’ stores.
330, 510