Passive Talent 2, Enlightened One: increases the flat energy produced by Musou Isshin for her party members (including herself) by 0.6% per 1% of Raiden's bonus Energy Recharge.

Talent Levels past 10 require Elemental Burst Level Increase methods, such as Constellations and Event bonuses. In her realm, Ei meditates in the sitting position of hanka fumisage ( Japanese: 半跏踏下 "half-lotus pendant"), a variant of the half-lotus position (but not necessarily a foot has to be placed on a thigh). In Buddhist art in Japan, this position is commonly used to depict the bodhisattva Miroku ( Japanese: 弥勒; Sanskrit: मैत्रेय Maitreya), an object of worship in Pure Land Buddhism that predates worship for Amida. Miroku is said to confine himself in his realm of Pure Land for meditation to achieve enlightenment and bring salvation to all sentient beings. Until the expected achievement of his enlightenment, he is believed to send his avatars to help this world on behalf of him. Beelzebul's self-confinement in her realm of Euthymia ("Pure Land" in the East Asian versions) and her use of a puppet for the mundane world may be inspired by this belief. Old: That's still the name the Anemo Archon takes among mortals these days, is it? Truth be told, from the very first moment I met him, I could somehow sense that we were not going to get along. Also, he sure can drink a lot.The Raiden Shogun's character teaser and character demo heavily emphasized the imagery of two Raiden Shoguns, which are meant to be Makoto and Ei. Ei is loosely based on Raiden Mei, a character from Houkai Gakuen 2 and Honkai Impact 3rd, other games created by miHoYo. Raiden Mei, Makoto, and Ei are strikingly similar to each other: Both Ei and The Shogun have recited multiple poems in the character demo and other media. (See Raiden Shogun/Lore) Constellation Level 1, Ominous Inscription: Increases the Resolve gained for Chakra Desiderata via Elemental Bursts by 80% for Electro characters and 20% for other characters.

The pinnacle of Ei's swordsmanship is the Musou no Hitotachi ( Japanese: 無想の一太刀 Musou no Hito-tachi, "One Slash of No Conception"), the symbol of ultimate power. [10] The sword skill is said to be only witnessed during "divine punishment." [10] The Energy regeneration effect from Musou Isshin will apply regardless of DMG being dealt. For example, hitting Electro Slimes or shielded Abyss Mages will still result in energy production.

Musou is short for Munen-Musou ( Japanese: 無念無想 "No Design, No Conception"). According to Victor Harris, a former Keeper of Japanese Antiquities at the British Museum in London, munen-musou in Japanese swordsmanship means "the ability to act calmly and naturally even in the face of danger. It is the highest accord with existence when a man's word and his actions are spontaneously the same." [16] (some spelling changes from the original text of Harris) Honkai Impact 3rd also has an official manga titled "Escape from Nagazora." It has a chapter called " The Wrath of Baal," which showcases Mei's first appearance as the Herrscher of Thunder.