Overview
The Raiden Shogun is a Burst-reliant on-field DPS that deals more damage the more Energy her teammates consume. When a teammate uses their Elemental Burst, the Shogun will gain 'Resolve' stacks based on the amount of Energy consumed: 0.2 Resolve per Energy. Through her Ascension 1 Passive, she will also gain 2 Resolve every time a teammate gains Energy through an Elemental Orb or Particle, and this effect has a cooldown of 3 seconds. Raiden's Burst has an 18 second cooldown, so this effect will typically activate about 5 times per rotation.
When Raiden uses her Burst, she will give the team extra Energy. The amount she refunds will usually be about 20 - 25.
The Raiden Shogun's Ascension 4 Passive will give her Electro DMG Bonus and increase the amount of Energy she restores to the team based on her ER above 100%, making it her most valuable stat in most ways.
Elemental Skill
The Raiden Shogun's Elemental Skill has a duration of 25 seconds and a cooldown of 10 seconds. It will deal a little Electro damage on cast, and will then perform Coordinated Attacks with the currently active character. The damage dealt by these attacks is quite low and has a 0.9 second cooldown. While this effect is active, the team gains 30% Burst DMG Bonus.
Elemental Burst & Musou Isshin
Secret Art: Musou Shinsetsu has an 18 second cooldown and an Energy cost of 90. This is the highest Energy cost in the game to date, and it is shared with
Yae Miko. When the Raiden Shogun unleashes her Elemental Burst, she will consume all Resolve stacks and perform a strong initial Electro AoE slash.
For the next 7 seconds, the Raiden Shogun's Normal and Charged Attack moveset will be radically altered as she enters the Musou Isshin state. She will gain special NAs and CAs ( and even Plunge Attacks ) that deal decent Electro damage. The damage they deal is considered Burst damage, making the entirety of her moveset (besides her Skill) scale with Burst DMG Bonus. This duration will typically be a little higher than 7 seconds due to Raiden's high hitlag. Hitlag is the mechanic that 'pauses' the game for a split second whenever you land a hit with Impact, and it increases the duration of effects like Raiden's Burst state.
When the Raiden Shogun lands a hit while in this state, she will restore some Energy to her entire team. At a baseline, at Talent Level 10, this will be 2.5 Energy, and she can only trigger this effect up to 5 times, on a 1 second cooldown. Because of her A4 Passive, this ends up being about 20 - 25 Energy to her team, depending on her Energy Recharge. With her
Engulfing Lightning, it can be up to 30.
Musou Isshin Combos
Both of the Raiden Shogun's NAs and CAs during this state are strong and useful. Generally, the easiest combo that still deals quite a bit of damage is 3N3C + N1C. This means that she performs 3 loops of [3 Normal Attacks + 1 Charged Attack] into [1 Normal Attack + 1 Charged Attack]. Typically easy to perform, and to improve on.
For example, changing the N1C into an N2C is difficult but not that difficult.
Her strongest combo for personal damage tends to be 3N3C + N4. The Raiden Shogun performs the same 3 loops of [3 Normal Attacks + 1 Charged Attack] as before, this time followed by 4 Normal Attacks instead of [1 Normal Attack + 1 Charged Attack].
Raiden can also opt to not use her CAs at all. A combo of 4 loops of 4 Normal Attacks will deal slightly less personal damage, but might slightly reduce rotation time. Which one is worth it highly depends on the team.