This is a lost spell, and cannot be researched unless your nation has been granted access to it.
Conjuring Ways
Easy
508
The character is at a population centre of their own nation
No information is required, but you may enter the number of mounts 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 5 mounts per point of natural mage rank of the character. The character must be at a population centre belonging to their own nation. If the number of mounts is not specified, or is given as zero, the maximum possible will be conjured.
330, 508, 200
330, 508, 0