Not sure if anyone has made a proper guide on building an arcane archer. Its a wheelchair mage build with full MA skills, ecumenical and either Necro/risen pets or beast mastery/creature control ( depending on which pets you want). Ive even seen one guy with both.
Its usually either a bony Vheela or a fat Oghmir mage build with no dex and enough strenght to use a short bow.
The idea is that you use the bow to kill the opponents horse, and then use pets/magic to kill them once they are dismounted.
Necro/risen gives you a risen horse (high hp) and strong single risen pet, but you cant go into towns with them.
While beast mastery you can get multiple pets like terror bird and wolves, or wolves and linx, or multiple dire wolves.
Its a wheelchair build, so dont get dismounted.