How are Psychic abilities different from Magical abilities?

Within the Tortured Earth multiverse, there is a categorical line separating magic from psychic abilities. Magical abilities require the use of knowledge of a previously unidentified force, its mechanical operation through the use of symbols (either written or through movement), and foci to shape the final expression of the is energy in the material world. If magic is viewed as a new physics, the spell is the equation by which the spell is shaped and understood. It also provides the 'math' under which the spell behaves as a predictable event rather than a random occurrence. As the mage increases in rank, it is assume the spell equation becomes more complex, allowing the caster to produce more devastating effects. It is important to note, a caster may always underpower a spell or effect without penalty. However, they cannot overpower an ability beyond the point of their investment in the skill. To assist in these 'calculations', foci offer a means of shaping the spell...