You can train your body, but it all depends on your constitution, which you can not train. Only warriors need to train this. Just like mana, faith, slyness and sense, it is a profession dependent skill. The warrior who is taught well in tactics can use many special attacks routines. Warriors who are smarter than others are better at tactics.
Intelligence is required.
The skill of casting. Spells are formulated in written form, and once learned can be invoked by several components, usually spoken. Spells involving the 4 elements fire, water, earth and air. A good constitution is helpful. Spells involving the element fire.