Magic
In this world, magic is tied to an Origin. Raw Magic can be granted by the Gods, taken by force or studied. As such, the Character Builder might reference a Type of magic. This differs from Standard 5e, where your class provides you with magic and a spellcasting ability modifier.
Each magic feature gained has a linked Origin. As such, you cannot use a spell slot gained from Pyromancy to cast an Arcane spell. The following Origins can be identified:
Pyromancy
Pyromancy gives access to destructive spells and a small array of soothing and smoothing healing spells.
Pyromancy spells use the Spellcasting Ability Modifier Wisdom + Intelligence.
Basic calculation is: 8 + Wisdom Modifier + Intelligence Modifier. The Proficiency Bonus is not used for Pyromancy.
Arcane Magic
Arcane magic is the study of the Old Powers, tapping into the infinite potential around you and harnass the strength around you. It's magic can bend reality and allow both creation and destruction.
Arcane spells use the Spellcasting Ability Modifier Intelligence. Basic calculation is: 8 + Intelligence + Proficiency Bonus
Divine Magic
The Divine Magic is granted by the Gods, or worship thereof. While a God doesn't always directly provide the magic or have the ability to take it away (as a traditional Paladin or Cleric might experience in d&d), the Gods are aware of the power being abused and might react to such. Divine Magic requires one or more Gods to worship.
Divine spells use the Spellcasting Ability Modifier Wisdom. Basic calculation is: 8 + Wisdom + Proficiency Bonus
Chaos Magic
Ah yes, Chaos Magic. The primordial magic that binds the world together. You cannot learn it, you cannot beg for it, believe me, many have tried. You either have it, or you do not.
Chaos Magic uses the Spellcasting Ability Modifier Intelligence. Basic calculation is: 8 + Charisma Modifier + Proficiency Bonus.
Dark Magic
The Dark Magic isn't wielded or learned. Some say you are the one being learned when you cast it. Dark Magic can be any Origin of magic. It is usually wielded by Witches, Warlocks, Fighters, Knights and peasants being too simpleminded, feeble or stubborn to learn magic in other ways. Dark Magic may be enhanced with Dark Gifts from the Character Builder or Profane Fragments.
Dark Magic uses no Spellcasting Ability Modifier. Basic Calculation is: 10 + Proficiency Bonus.