The potential to command sorcery is not always given by Fate...
Sorcerers carry the ability to cast spells internally. Raw sorcery flows through their veins. Most of the time, this ability is rare and who is granted the ability is decided by chance. In a world where the very fabric of the universe can be manipulated, there are those who seek to control this chance.
...but sometimes taken by those who seek it
Potent elixirs. Fiendish bones piercing the flesh. Psionic crystals grafted into the body. Arcane runes tattooed all over the skin. Those who have undergone eldritch metamorphoses have been known to use various methods to acquire their arcane abilities. Whatever the method, the result is the same. The body changes and grants the gift of spellcasting.
Those who have undergone the eldritch metamorphosis are sorcerers who, rather than being born with a gift or given by a fateful accident, have taken this gift and thrust it unto themselves to become sorcerers by design. The process is lengthy and oftentimes painful, but it causes permanent changes to their bodies that will let them channel and direct magic. There are many different ways for this process to succeed and countless ways for it to fail, but there is always a definite intention behind going through an eldritch metamorphosis.
