Maximum sandbag padding setup
As a burst-orientated class, this set synergizes with her kit, granting massive bonuses like Skill DMG, Crit Rate & Crit DMG for 8s (12s with the set bonus) when you align all of the conditional effects. In practice? Ensuring that all the bonus effects activate at the right time, not to mention micro-managing pets, cooldowns and your personal buffs, makes this set annoying to optimize if the boss hadn't died in the inital burst window, and performs much worse the lower your weapon enhancement is. CN guides imply +18 weapon minimum, but it's unclear whether you can get away with a +15 weapon.
The individual pieces are very good however, and they're often used in other builds.
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  Might Chariot Helmet

  After casting a finisher, gains Chariot Banner, increasing Skill DMG by 12% for 8s. After the effect expires, gain Chariot Banner Mark until the next Chariot Banner is gained.
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  Mighty Chariot Breastplate

  After casting a Resonance Skill, gain Chariot Horn, increasing Crit DMG by 18% for 8s. After the effect expires, gain Chariot Horn Mark until the next Chariot Horn is gained.
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  Mighty Chariot Pants

  After casting any active skill, gain Chariot Charge, increasing Physical & Magical PEN by 10% for 8s. After the effect expires, gain Chariot Charge Mark until the next Chariot Charge is gained.
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  Mighty Chariot Gloves

  After casting a Pet skill, gain Chariot Beast, increasing Crit Rate by 12% for 8s. After the effect expires, gain Chariot Beast Mark until the next Chariot Beast is gained.

The sustain set is straightforward: press buttons get buffs that lets you do more damage and lower cooldowns. However, Scytheguards can't consistently multi-hit 10 times in a single skill to proc conditionals (only 4 skills can do this) as they're a burst-orientated class. King's Cavalry also lacks Crit Rate, which may be a deal-breaker for those who have invested into other stats such as Attribute ENH.

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  King's Cavalry Helmet

  Dealing Pyro/Cryo/Electro/Umbro damage 10 times in a single skill lowers all your skill cooldowns by 0.25s on a 1s cooldown.
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  King's Cavalry Shoes

  Gain a burst of speed (+100% MSPD, decays to 0% after 0.5s) when casting skills, every 10% MSPD gain +1% DMG up to +13%.
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  King's Cavalry Gloves

  Gain DMG increase based on the distance between you and the enemy, up to 10%. Minimum +4% DMG within 5m (to be tested), and +2% every additional 5m.

The gloves don't benefit Scytheguard as much beyond the unconditional +4% DMG boost (to be tested), but the other pieces benefit Basic Attack classes more, which Scytheguard does not focus on, or the conditional effects are much harder to optimize around:

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  King's Cavalry Breastplate

  Increases DMG by 1.2% for every 10 Combos, up to 12%. (Minimum 40 combos for +4.8% DMG)
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  King's Cavalry Pants

  Skills and Basic Attacks while airbone deal 10% more DMG.

The support set, compared to the DPS set, focuses around giving additional aura buffs to allies and debuffing enemies defenses, while greatly improving your heals. You still get bonuses that improve your personal DPS, but obviously not as much compared to the two sets mentioned above.
Default choice for those who care more about consistency and stable output.

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  Might Chariot Helmet

  After casting a finisher, gains Chariot Banner, increasing Skill DMG by 12% for 8s. After the effect expires, gain Chariot Banner Mark until the next Chariot Banner is gained.
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  Unforgiving Darkness Helmet

  After entering combat, +15% Healing Effect. When HP falls below 50% and no barriers/shields are active, regen 3% HP every 3s (Also applies to teammates within 5m)
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  Unforgiving Darkness Gloves

  Crit & Non-Crit DMG +5%
  PCrit & MCrit + 2%
  After entering combat, PCrit & MCrit +8%. Increases PCrit & MCrit by 4% for all allies within 100m. Neither effect stacks.
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  Unforgiving Darkness Pants

  Gain Attribute inflict based on your highest attribute. When dealing Attribute damage, lower the enemy's All-Attribute RES by 1 for 5s, up to 11 points.
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  Unforgiving Darkness Shoes

  After entering combat, gain +8% Physical & Magic PEN. Each crit reduces enemies' PDEF & MDEF by 0.5% for 5s, up to 5%.

The breastplate isn't recommended because it only improves PDEF and MDEF, and that's not impactful as using your DMG Res aura. Also, people will die anyways if they're constantly eating attacks regardless...