You lose around 30% damage output without Lightning Storm active.
C0-C3 Beidous looking to maximize damage output will want to use 4-hit run cancels and full combo dash cancels.
C4-C6 Beidous can consider using 2-hit run cancel rotations when they want to prioritize Electro damage output.
Frame Analysis of Beidou’s Parry
Beidou perfect parry has 2 startup frames, 17 active frames +/- 1 frame
Input overlay to detect inputs, counting from 1 on the frame after the input is registered. Large slime's jump attack previously established to create an active hitbox on the frame that the "spark" effect appears as it hits the ground. All counts made between when the input overlay registers the input (frame 0) and the slime's first active hitbox frame. As always, results are fuzzy by +/- 1 frame due to discrepancies between game simulation and graphical rendering.
Significance: Beidou's extremely strong potential burst damage is evidently achievable by many players, as the timing window is only marginally tougher than dodging. Serious consideration should be given to "gitting gud" and making use of Beidou burst DPS.
Beidou E Particle Mechanics
Theory/Findings: Beidou's Tidecaller particle production mechanic actually has no RNG assigned to it at all. It produce at base 2 particles, and every charge you gain on your tidecaller increases the particles produced by 1, capping at 4 (2 charge). In addition, Perfect Parry automatically provides 2 charges for particle production as well, in addition to damage, and if the skill were held after a perfect parry, even if you don't get hit at all, it will still be executed at max charge.
Evidence/Testing: A series of 100 E casts of each following category was executed
Beidou's Q discharge cooldown is stated to be 1s or 60 frames. The counter for these 60 frames does not start on when Beidou's lightning discharge hits, but when the normal attack hits.
However, since the trigger for a discharge is on a normal attack damage instance and damage instances are determined server-side, the discharge CD can be randomly and inconsistently affected by ping spikes and is not consistently 60 frames.
The closer to 60 frames between each attack, the more likely ping inconsistencies will cause you to miss a Q discharge.
In this video, there are two cases analyzed.
First case: 00:30
NA proc - frame 0
Beidou Q - frame 4
NA proc - frame 62
no Beidou Q proc
There are 62 frames between the first and second NA. However, a second Beidou Q discharge does not proc.
Second case: 00:50
NA proc - frame 440
Beidou Q - frame 446
NA proc - frame 501
Beidou Q proc - 507
There are 61 frames between the first and second NA. In this case, two Beidou Q discharges proc within 61 frames of each other.
Ping variance can cause some inconsistencies with Beidou.
Beidou's Elemental Burst, Skill DMG and Lightning DMG, snapshot at different timings.
Test timings of Beidou's Burst inside Bennett ultimate, both intentionally waiting for the Bennett ATK Buff and casting Burst, and intentionally quick swapping to not snapshot the Bennett ATK Buff and casting burst.
Youtube: No snapshot, Skill DMG 16444, Lightning DMG 8906
(The difference of the Skill DMG is due to losing 1 stack of Serpent Spine.)
In both clips, the Skill DMG snapshots Beidou's stats when it hits, when she has the Bennett ATK Buff. However in the no snapshot clip, as Beidou's Lightning DMG snapshots instantly on cast, and thus, the no snapshot clip has less Lightning DMG.
In the dire circumstance that you cast Beidou's Elemental Burst too fast to snapshot the Lightning DMG, you still salvage some damage as the Skill DMG snapshots later. It is still best to wait for the buffs to appear, to buff both Skill and Lighting DMG.
C4: Stunning Revenge
Mistranslation of Beidou’s C4 Effect
Beidou’s C4 is mistranslated:
Current description, Within 10s of taking DMG, Beidou's Normal Attacks gain 20% additional Electro DMG.
Correct description, Within 10s of taking DMG, Beidou's Normal Attacks AND CHARGED ATTACKS gain 20% additional Electro DMG.
Sara's Tengou Juurai: Ambush activates Beidou's C4 when it hits (buffs) Beidou.
Evidence:Video: In this video you can see that Beidou's weapon is normal and after she gets hit by Tengou Juurai: Ambush her weapon starts sparking with electro, indicating that C4 has been activated.
Neat interaction for Beidou
Does The Bell’s passive affect Beidou’s Elemental Skill DMG?
The passive on The Bell (4*), influences Beidou’s damage on Tidecaller (E Counter).
Evidence:Twitch Clip lost to the sands of time
Damage with The Bell: 111
Damage with a weapon of same Base ATK: 98
(In addition, the total amount of shields does not increase the percentage of damage bonus from Bell's passive. This was tested through a similar method, using Diona, Crystalize, Noelle, and Beidou shield at the same time. The damage remained consistent)
The bell will provide its damage bonus with concurrent abilities such as Beidou’s Tidecaller.
Beidou's 'E' skill shield triggers The Bell's passive for 12% increased DMG every time irrespective of cooldown