Almighty is a special category of magic and skills that appears in the Megami Tensei franchise and in the spin-off title Tokyo Mirage Sessions ♯FE.
Almighty skills (usually embodied by the "Megido" line of spells) are non-elemental and thus are not subject to categorical defenses, save for very specific circumstances. This means that unlike the standard Anima magics like Fire, Thunder, and Wind, Almighty skills cannot be repelled or nullified, and thus are guaranteed to strike most targets with full force. The trade off for the ability to bypass elemental defenses is the much higher spell cost of Almighty spells, making prolonged use of Almighty spells inefficient. Because they do not strike weaknesses, Almighty skills cannot trigger Sessions.