Game Breaker/Literature

Examples of Game Breakers in Literature include:

In Mistborn the two primary magic systems are allomancy (where small pieces of particular metals are swallowed and then "burned" to grant particular superhuman powers) and feruchemy (where one can store up one's own attributes in pieces of metal and tap into them later- for example, becoming very weak and frail for a time lets you store the energy to gain Super Strength at a later time). For the most part, the two systems are Mutually Exclusive Magic- except for the Lord Ruler, who was both an allomancer and a feruchemist, meaning that he could swallow and burn metals in which he'd stored his own qualities, giving him access to insane amounts of power that no-one else in the series could match.