Oblivion:Game Mechanics
Not to be confused with Glitches, Game Mechanics are intended aspects of gameplay that can be exploited using intended user actions. The end result of exploiting these mechanics likely was not intended in some cases.
Spell Stacking
Full Article: Spell Stacking
Spell Stacking is a mechanic where the player can use Weakness to Magic to recursively boost the magnitude of spells with negative effects on subsequent spell casts, including Weakness to Magic itself. This allows for casting spells with incredibly large magnitudes relatively easily, enabling the player to reach absurdly high stat values.