Magic is not as prevalent on Tempest as it is on some other worlds in the multiverse. The magic that does exist is very ritualized and nature and storm based. All magic requires Spelrite to cast. Most magic also requires magic circles and rituals in order to be cast.
Divine magic focuses on asking for protection from the elements, calming the winds or asking for divine wrath via storms.
Arcane magic is very unstable due to the mana in the air constantly being in tumult from the Mana Storms.
In gameplay terms this means all spells require spelrite as a reagent and all but the most simple spells take longer than a single round to cast.