I recommend to read this post in dark mode.
Hello and welcome to this Jovial Deception: Shadowdimmer - Songque Team Guide!
I hope I'll be able to help you, let's start~
For more guides you can check here! (I needed a list to find my own guides lol)
Note: This guide is based on the BETA. Officially released content might differ.
✦ Table of contents ✦
Introduction & Notes
Support buffs
Crit Rate calculations
DMG Comparison
AR Intensity considerations
Conclusion
✦ Introduction & Notes ✦
Songque is the new S-Rank Valkyrie of 7.4, introducing Physical DMG to the Part 2 cast. For details on her, please read my Songque Guide:
This guide is entirely focused on the S-Ranks of Part 2. If you don't have two of them you don't really have a choice anyway. Details on all Part 2 Valkyries:
✧ Abbreviations ✧
Just a short summary to make sure the Guide is understandable!
AR - Astral Ring
WoD - Wheel of Destiny Specialization
SO - Stellar Outburst
HS tag - Harmonized Shadow Star tag (WoD)
JDS - Jovial Deception: Shadowdimmer (Songque)
MPS - Mad Pleasure: Shadowfighter (Thelema)
LDS - Lone Destruction: Shadowchaser (Lantern)
FL - Deepspace Anchor: First Light (Senadina)
SQ - Songque (AstralOP)
When I talk about her I'll either specifically mention its about the AstralOP or say SQ to avoid confusion
Sera - Serapeum (AstralOP)
✧ My intention ✧
I'd firstly like to note this is purely meta perspective, mainly for Nirvana and Redlotus players. At lower Disturbance the required teams often change a lot. It might still help, but excuse me if it doesn't fit too well 
Also I'd like to apologise beforehand for a lot of text, it's mostly going into the theory behind the teams, so I had to 
Also this Guide is purely focused on her DPS gameplay.
Her WoD support ability is pretty simple:
Thelema/Lantern DPS
Senadina support required
Lantern/Thelema > Songque > Coralie
✦ Support Buffs ✦
Note beforehand: I only count buffs Songque gets and can use. Assumes 4/4 and S0 of all characters.
✧ Senadina (FL) ✧
While Senadina's Total DMG vulnerability buff is rather low, she has really high common multipliers.
Also her Crit Rate buff is pretty important, but I'll get to that later.
✧ Thelema (MPS) ✧
With Thelema we got a big lack of Crit stats, as in Stellar Outburst she doesn't provide any.
Her other buffs are all pretty valid, while she especially shined with her Total DMG taken.
✧ "Lantern" (LDS) ✧
Lantern's huge benefit is her consistend Crit buff.
She is a good all-rounder, but this causes her to give little of every buff rather than big numbers.
✧ Support Comparison ✧
Putting all numbers in comparison to clearly see the benefits and issues of each support. Sorry for the wall of text beforehand, necessary to point out the teams' synergies.
Sorry for it being a little messy, it's as good as I managed to do it
Considering we're looking for two team mates, I'll go over all different combinations and show their weaknesses and strengths.
For that, it is important to know how DMG multipliers work in Honkai, basically you multply everything with each other
Raw DMG * Total DMG * Physical DMG * Total DMG taken * Phys DMG taken * Crit DMG (if crit)
not going into details, but this causes an even spread between different scalings the key for high DMG. Please note Physical and Total DMG are really common though and Songque gets a lot of them by herself, making other scalings take priority.
✧ FL/MPS ✧
Overall these two have the best synergy buff-wise.
Big Total DMG (~90%) and Physical DMG (160~170%), but also Crit Rate (22%). However, it has to be noted this is the lowest Crit Rate of all team combinations.
However, Thelema perfectly makes up for Senadina's Total DMG taken, ending at ~60%.
Overall they just perfectly make up for each other's weaknesses, mostly having a high scaling in multipliers the other one lacks.
✧ LDS/MPS ✧
Lantern's wide-spread buffs cause her to not being able to make up Thelema's weaknesses too well.
However, they still have a nice synergy due to Thelema's multipliers not being too focused on specific stats and her shining in rare multipliers. Lantern provides good Crit Rate (30%) and they end up with ~60% Total DMG, 100~130% Physical DMG and high vulnerability stats.
It isn't far behind, but the slightly worse synergy causes this team to fall behind a little DMG-wise.
✧ LDS/FL ✧
While this team shines with a high Crit Rate (52%), it falls behind on the more rare vulnerability buffs.
Senadina is mostly focused on less rare multipliers, causing Lantern's buffs to not synergise well with her. Senadina has a great weakness with the lack of Total DMG taken, for which Lantern cannot make up fully.
It's usable for consistency, but falls behind on DMG.
✦ Crit Rate calculations ✦
Lets quickly go over all Songque's Crit Rate sources.
Disclaimer: CRT doesn't equal to Crit Rate. It's calculated with it though. Don't ask me why, I don't know.
Valkyrie (lvl80): 54 CRT ➔ ~11,4% Crit Rate
Weapon (PRI, lvl65): 37 CRT ➔ ~7,8% Crit Rate
Stigmata (MB): 21 CRT ➔ ~4,4% Crit Rate
Stig Effects: 15% Crit Rate
Emblem (RL/Nirb/Myriad): 5/6/7 CRT ➔ 1,1~1,5% Crit Rate
Divine Keys: Up to 20 CRT ➔ ~4,2% Crit Rate
Skills: +5,5% for each Shadow Frame / Odd Thought consumed during the ATK
Skills (specific): +20% Crit Rate for Ultimate and Combo ATK
=> ~44,1% Crit Rate + 20% for Ultimate and Combo ATK
Lantern provides 30% Crit Rate and Senadina 22%. This means:
+ Lantern: 74,1% (Ult/Combo: +20%) (WA: +5,5 x Special Charge consumed)
+ Senadina: 66,1% (Ult/Combo: +20%) (WA: +5,5 x Special Charge consumed)
+ Lantern + Senadina: 96,1% (Ult/Combo/WA guaranteed Crit)
Without Serapeum as AstralOP (who gets your Crit Rate to 100% through Crit conversion) you'll end up with slight Crit issues, better or worse depending on the team.
Lantern is the key for consistent crits, Senadina might need more resets. Sera is the final buff too 100% Crit Rate.
So if you don't have Sera, please keep this in mind depending on how much you're willing to grind.
✦ DMG comparison ✦
No more time for edits help
For details on different AstralOPs due to Crit issues (average Crits taken):
✧ Analysis ✧
As you can see, the DMG difference isn't as big.
I'd like to mention how high Crit Rate teams lose out on more DMG when not having Sera as they have to convert way less Crit DMG into Crit Rate.
I explained how it's getting to the MPS/FL > MPS/LDS > LDS/FL DMG in the Support Comparison already.
Now, while 3% DMG doesn't seem like much (and mostly isn't), it has to be noted that, especially without Sera, the lower Crit Rate teams have greater potential to outdo the high Crit Rate comps by Crit malding. It takes a while, but can actually end up in 3-4 million DMG more with really good crits.
With Sera the teams will do really similarly DMG-wise, but without MPS/FL and MPS/LDS might prove themselves to have a great benefit if you have the time and motivation to go bald. Because trust me, a few million DMG can definitely make a huge difference by reaching DMG tresholds.
Overall it can be said that while all teams are pretty close, you might end up still feeling the difference. However, even in Nirvana all teams will be usable.
✦ AR Intensity considerations ✦
Let's just summarise the most important points.
✦ When using Songque AstralOP, Senadina provides 25 more Starting Intensity
✦ Thelema and Lantern each provide 10 more Intensity per Stellar Outburst, enabling a quicker second Outburst
✦ Lantern and Thelema both use their Stellar Drain easily and early during their support rotation, allowing an earlier Outburst.
Overall it can be said that SS Serapeum allows a fast double Outburst with Lantern and Thelema. If this is usable they'll score highest. Their early first Outburst also enables MA strats.
Otherwise, if Thelema/Senadina reaches the same amount of Outbursts they'll do better.
Example on a double Outburst strat:
(Video by Akayuki - YouTube, feel free to check out the channel!)
One Outburst run:
(The score difference mainly comes from ranks, this is purely to show the difference in AR regeneration)
When not having SS Sera and especially when using Songque that MPS/LDS often is bound to one Outburst as well.
✦ Conclusion ✦
The best team ends up being between FL/MPS and MPS/LDS.
With SS Sera and the additional Outburst available, MPS/LDS shows a great Score buff. In MA it'll always be the way to go unless you're using SQ as AstralOP.
As soon as the Intensity benefit isn't available anymore, FL/MPS takes over.
That being said FL/LDS isn't far behind and can absolutely score well in Nirvana too. In fact, it is a really comfy option when not having Sera.
Credits
- Thanks to Cyxo and Alpaca for the pictures of Valkyrie icons and such!
- Love to Inari <3
- Thanks to herrscherofslack for allowing me to use his video!
- Website for official wallpapers in case you're interested, here
test details
Songque: S0 unless said otherwise, ~90 ATK from affixes
*any supports have 6x 23 affixes and full signature
(FL/MPS):
MPS Ultimate -> Moment of Indulgence -> Basic ATK x3
FL QTE -> Ultimate
JDS QTE -> Basic ATK x5 -> Combo ATK -> Ultimate -> Basic ATK x6 -> Combo ATK -> STELLAR OUTBURST -> FL Phantom -> WA -> Combo ATK -> Basic ATK x3 -> WA x6 -> MPS Phantom -> Combo ATK -> WA -> Combo ATK -> Ultimate
(FL/LDS):
FL Evasion -> Basic ATK
LDS QTE -> Combo ATK -> Ultimate
JDS QTE -> Basic ATK x5 -> Combo ATK -> Ultimate -> Basic ATK x6 -> Combo ATK -> STELLAR OUTBURST -> FL Phantom -> WA -> Combo ATK -> Basic ATK x3 -> WA x6 -> MPS Phantom -> Combo ATK -> WA -> Combo ATK -> Ultimate
(MPS/FL):
MPS Ultimate -> Moment of Indulgence -> Basic ATK x3
LDS QTE -> Combo ATK -> Ultimate
JDS QTE -> Basic ATK x5 -> Combo ATK -> Ultimate -> Basic ATK x6 -> Combo ATK -> STELLAR OUTBURST -> FL Phantom -> WA -> Combo ATK -> Basic ATK x3 -> WA x6 -> MPS Phantom -> Combo ATK -> WA -> Combo ATK -> Ultimate
Thanks for reading my guide, I hope I was able to help you!
Have a great day 
