Almighty Skills

Almighty (万能, bannō) skills carry a special, non-elemental property and are usually not hindered by defenses such as repel or drain, barring a few exceptions like that of innate Almighty resistance from certain bosses (Noah and Lucifer in Shin Megami Tensei III: Nocturne), along with the new Passive skill Anti-Almighty in Shin Megami Tensei: Devil Survivor 2. Almighy skills can be physical or magical.

In the Persona 2 duology, Almighty-elemental also includes some very generic ailment inflicting spells such as poison, seal, illusion and berserk and is resilient to enemies with all-purpose Magic resistance. The "elemental" that works the similar way in other installments is strictly called "Non-elemental" (無視, mushi).

General

 * Megido is a shortened spelling of . (Mount Megiddo) is the place described in the Bible where  will take place.
 * The mythology behind Death Flies is quite straightforward - Beelzebub is commonly known as the "Lord of the Flies", which he uses to carry the souls of the dead.
 * Mount Sinai was the location where Moses received the Ten Commandments from God. According to the Bible, a huge fire erupted as God descended onto the mountain. This is very appropriate due to it being Metatron's exclusive skill.

Sacrificial
In each game, there are skills that sacrifice the caster.

Zan Family
In Persona 2, Zan spells do Almighty elemental damage; Mazan spells are unavailable.

Gry Family
In Persona 2, Gry was a group-damage almighty elemental family, instead of belonging to the Gravity family in Megami Ibunroku Persona.

Specific Spell
In the Persona 3 / Persona 4 duology, the storyline skills Great Seal and Myriad Truths are also considered in-game to be Almighty Skills.

Persona 2 Specific
* Also deals Light damage
 * Skills unique to the Persona 2 duology

Shin Megami Tensei Nocturne Specific

 * Skills unique to Shin Megami Tensei III: Nocturne.

Digital Devil Saga: Avatar Tuner Specific

 * Skills unique to Digital Devil Saga: Avatar Tuner.

Devil Survivor Specific
Megidoladyne is not a move used when attacking, but a field attack. While it initially does mega damage (around 500 to a character/demon with 40 MA), it grows in power 50% in relation to the last use each time it is cast and is absolutely fatal after 4-5 uses. It hits all player parties.
 * Skills unique to Devil Survivor.

Soul Hackers Specific

 * Skills unique to Devil Summoner: Soul Hackers.

Strange Journey Specific
Parenthesized numbers are power levels used by the game for damage calculation. For comparison, Megido is 200, Megidola 300, Megidolaon 400, -dyne spells are 200, and Ma-dyne spells are 160. Also, all skills in Strange Journey are MP skills (no skills cost HP). Moan Bullet is a skill on the guns Ebony Tear, Meteor Dragoon, and Peacemaker. Freischutz is a skill on the gun Meteor Dragoon. Riot Gun Copy is a skill on the gun Megido Fire. Due to the way damage from gun skills is calculated (factoring in the gun's normal attack power), these skills often do more damage than demon skills.
 * Skills unique to Shin Megami Tensei: Strange Journey

Desperate Hit's rating of Medium is misleading and that the official rating of 100 power is likely inaccurate, as against bosses, three or more hits (300-500 power) does more damage than Jihad (500 power)

Strangely, Zelenin's attack Megiddo Storm does electric damage, not almighty, regardless of its name having the same origin as the Megido spell chain.