Bridal Shanna

Weapon: Rose-Quartz Bow

Assist: Draw Back / Reposition

Special: Moonbow / Luna / Draconic Aura

Passive A: Swift Sparrow / Atk/Spd Catch 4

Passive B: A/D Far Trace / Desperation

Passive C: Atk/Def Rein 

Sacred Seal: Swift Sparrow / Heavy Blade / Blade Session / Atk/Spd Solo

• Shanna's base skills don't leave much to the imagination: Swift Sparrow 3, Atk/Def Rein, and A/D Far Trace all provide their fair share of offensive boosts on top of what Rose-Quartz Bow already provides. The only necessary action needed is filling in her empty Assist slot with a movement skill of your preference — you can never go wrong with Draw Back or Reposition.
• The Rose-Quartz Bow provides a simple but potent gift bundle of offensive effects: under very easy conditions, it basically provides +9 Atk (the flat +3 plus +6 Atk if Shanna initiates or is near allies), +6 Spd, and deals free true damage equivalent to 20% of Shanna's Speed. While it's not the most stacked or intimidating weapon, it will prove to be quite the one-shot killer in battle combined with Shanna's other skills and great offensive stats. 
• A/D Far Trace grants extra bulk and damage as well as the option of post-combat moment after combat, allowing them to mobilize to areas of your choice, especially away from enemy territory. 
  • However, to grant extra safety when initiating combat (as Rose-Quartz Bow unfortunately lacks counterattack cancellation effects like Mirage Bow or Survivalist Bow), Desperation is a decent alternative. Below 75% health, it makes Shanna's often-occurring follow-up attacks occur immediately before enemy counterattacks, giving Shanna a chance to nip it in the bud before being defeated herself.
• There's pretty much almost no good reason to replace Shanna's base Atk/Def Rein, which improves her single-shot output and has intrinsic value in its rarity. As usual however, it's fine to consider other C slot options depending on your team composition. 
• While Draconic Aura is mostly fine to keep given Shanna's fantastic final Attack stat after skills, Moonbow tends to be more reliable given it requires shorter cooldown bursts, and Luna helps Shanna chunk past exceptionally high Defense enemies with similar timing to Aura. 
• Given the offensive nature of this build as well as Rose-Quartz Bow's Speed-based true damage, Swift Sparrow in both the A-slot and Sacred Seal is a pretty baller choice. There's a few A-slot choices that inch out better in Atk/Spd boosts (such as Atk/Spd Catch), but it's not worth raising hairs over the majority of the time. The Sacred Seal also has many great alternative choices, including Atk/Spd Solo, Heavy Blade (which combos well with the Attack debuffs that Shanna's base skills provide), and the potentially powerful, newly-minted Blade Session.

Weapon: Brave Bow+

Assist: Draw Back / Reposition

Special: Moonbow / Luna

Passive A: Swift Sparrow / Atk/Spd Catch / Death Blow 4 / Other Atk/Spd swing skills

Passive B: A/D Far Trace

Passive C: Atk/Def Rein / Spd/Def Rein

Sacred Seal: Death Blow / Life and Death / Swift Sparrow / Blade Sessions 

• Brave Bow can be seen as a more practiced weapon compared to Rose-Quartz Bow for quite a number of people. That is, the fact that it hits twice per initiation (up to potentially four hits if Shanna makes a follow-up attack) strike means it tends to deal more damage in a single strike, despite having lower might compared to Rose-Quartz Bow's damage stacking effects.
  • It doesn't quite outmatch Rose-Quartz overall, though, as it guarantees safer first strikes but is more susceptible to being defeated by physically bulkier enemies. Additionally, the -5 Speed deficit compared to Rose-Quartz Bow's +6 Atk/Spd means Dodge tank units are more easily able to reduce damage from incoming Brave Bow hits.
• Due to Brave Bow's lower Might per hit and extreme focus on blitz damage, users of it will tend to stack as many Attack-boosting skills and enemy Defense debuffs as possible. Fortunately, thanks to Shanna's insanely optimized base skills, there's not a lot to think about here at all: 
  • Swift Sparrow 3 is already pretty well-known at this point for being a strong and straightforward Atk/Spd boost when initiating. 
  • Additionally, the combination of A/D Far Trace and Atk/Def Rein inflicts a total Defense debuff of -7 on the enemy in every matchup, which is ever-so appreciated for single-shot focus weapons like Brave Bow. Far Trace also gives Shanna some post-combat movement options which can be handy to escape enemy range following a kill. 
  • After upping Shanna's Attack further with Sacred Seal like Death Blow or Life and Death, the build kinda writes itself out at this point. 
• There's not much room to improve if you want to change skills at all. Though, you can take slightly higher Attack swings in skills such as Death Blow 4 or Atk/Spd Catch 4 (assuming its two conditions are both fulfilled), and Spd/Def Rein is a nice sidegrade for those wishing to improve Shanna's quad-attacking potential instead.  
• To break through the bulk of higher-Defense enemies who will sometimes prey on the lower power per strike of this build, Moonbow and Luna are vastly preferred as offensive Specials as usual.