A beach event needs some brilliantly suitable attire. The second Quick-focused Mystic Code to be released, this Mystic Code provides a mix of offensive, defensive and utility options. Although this versatility, and the Quick focus, aren't really that useful in practice until the release of Skadi.
There are very few situation in which a party-wide Quick buff would be more preferable to a single Quick buff while the NP Gauge Boost is simply too minor to have a profound effect on performance. The Piece Invincibility can be useful however, but often more elegant solutions are available to circumvent or deal with enemy damage immunity.
Rumble Party grants an up to a 30% party wide Quick buff for 1 turn. Since Quick performance buffs also increase the NP generation and star generation for Quick cards, it works well with Servants who can capitalize on either of these effects. Generally, it is more effective to perform a Brave Chain or one single powerful NP rather than consecutive Quick NPs in the same turn however. As a result, the team-wide aspect of this buff is generally inferior to the more powerful steroid on the Royal Brand Mystic Code.
Deadly Trident provides Pierce Invincibility to one Servant for 1 turn. Pierce Invincibility is situationally very useful for dealing with Evasion or Invincibility spamming enemies such as Cu Chulainn or Marie Antoinette. Still, there are plenty of other ways to deal with these sort of enemies that do not require choosing a less than optimal Mystic Code for the sake of Pierce Invincibility alone.
Beach House Shower provides the same amount of healing, up to 3000, as the standard Mystic Code Chaldea but adds a small NP gauge boost of 10% in exchange for a longer cooldown. Sadly, the boost in NP gauge is too small to be of significant use but it can enable some specific Craft Essence combinations with Servants that also provide an NP gauge boost such as Waver or Helena. Note that for Quick Servants, once Skadi has been released, it is often better to provide more Quick buffs or NP generation buffs as their refund potential is often better than just 10%.
Notable Strategies and Users:
The use of this Mystic Code is similar to the Royal Brand - Quick Servants or Servants with Quick NPs benefit most, such as Jack the Ripper, Okita-Souji or Lancelot. Generally other Mystic Codes can provide stronger or more broadly applicable damage buffs however. To fully extract all value from Rumble Party requires the use of multiple NPs from the whole party. Sadly, this tends to yield less sustained damage and isn't usually worth it. Even the NP gauge boost is too minor to truly be of much use in extended fights - but can have some use in 3-turn setups when farming.
This Mystic Code levels fast enough, but each level adds relatively little with mostly the effect of the healing seeing significant increases in value. The cooldown of each skill is generally too long for repeated use and the NP gauge increase remains a static 10% at every level. Masters could wait with leveling it until they have some suitable Quick teams to use with it (or a good Quick Support).
How to UnlockMystic Code Quest: Brilliant Summer
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Mystic Code Skills
Increases party's Quick performance for 1 turn.
Grants one servant Pierce Invincibility status for 1 turn.
Recovers one servant's HP. Charges their NP gauge by 10%.