FGO Servant Summer Festival 2020 - Challenge Guide: Eighth Day, Grand Finale!

The Main Quest line for the Servant Summer Festival 2020 ("Farewell", on Day 7 after completing all Raids) and Singularity: Solomon must be completed before this quest can be attempted.

Boss Break Effect Summary

Servant	NP Type	Break Skill
→	AoE → ST		Go Away, Heat!: Remove own debuffs. Increase own ATK by 30% (3 turns). Decrease own DEF by 30% (3 turns).
→	AoE → AoE		Fine. I'll School You!: Increase own Critical Strength by 30% (3 turns).
→	AoE → ST		Nobunaga THE Rock N' Roll!: Increase own NP Gauge to MAX.
→	AoE → AoE		Disrespectful!: Apply Evade to self (1 turn). * Also has a Taunt skill.
→	AoE → ST		This Prefect Will Not Let It Pass!: Increase own Critical Rate by 50% (3 turns).
→	AoE → ST		This Is What Summer Help Is All About!: Decrease Critical Star Drop Rate for all enemies by 50% (3 turns).
→	AoE → AoE		This Summer's All About Me!: Increase own NP Gauge by 1.
→	AoE → AoE		Let's Start Making Summer Memories!: Decrease ATK for all enemies by 30% (3 turns).

• The final battle of summer is characterized by the two HP bars possessed by each enemy Servant. After the first (and much smaller) HP bar is depleted, the Servant will fittingly turn into their summer form, gaining a Break effect in the process. The second HP bar, while still moderate in nature, will be considerably larger than the first, ranging from Nero’s 82,110 to Ishtar’s 130,053. The battlefield counts as having the [near water] property.
• Due to the large number of enemies, each with their own Break bar, the minimum turn count for this fight is 6 turns, assuming the party fully depletes all of the enemies’ HP bars each turn. As such, while higher-budget (typically Arts) teams specializing in consistent AoE damage might find this stage to be a breeze, other teams, especially those without easy access to sustained damage or survivability, may find a war of attrition waiting for them instead.
• Among all Break effects, Nobunaga’s is the most notable, as she fully charges her NP bars upon Break. Thankfully, her Berserker form’s NP is single-target, meaning that it can either be defended against easily (through Taunt or party-wide Invincibility/Evasion), or even made use of to force a frontline Servant to make way for another from the backlines, the latter of which can be used to facilitate buff stacking strategies.
• The enemies’ NP bar charges do not reset upon Break, and so it is important to note Servants whose second form has less NP bars compared to their initial form (notably Helena and Nitocris, whose Archer and Assassin versions come with 3 NP bars opposed to their initial 5).
• For Masters without much in the way of AoE Arts setups, it may be a good idea to use lower-damage, AoE Servants with Instant NP Charge, allowing the party to deplete enemies’ first HP bars without use of high damaging NPs, which can then be saved for the second bars. It is also an option to manually Break each enemy with normal cards, but this takes significantly longer and places extra burden on the party’s survivability.
• In summary, 8 Days, Grand Finale! is a test on the party’s consistency, be it in regards to damage or survivability. If one is able to weather the incoming damage and properly manage the use of both offensive and defensive options, they will be greeted by the merriment and spirit of summer. Fail to do so, and they will eventually find themselves drowning under the oceans’ endless blue waves.

• Jeanne d’Arc is known to be capable of soloing the stage. However, this might require either NP2 (for the increased Defense buff) and/or the use of specific CEs (such as Maid in Halloween or Iron-Willed Training). Amakusa Shirou is also known to be capable of the feat, but the requirements are probably even more restrictive compared to Jeanne.
• While high-end compositions based on any of three card types are able to deal with the stage quite effectively, Arts tends to do the best in regards to turn count. This is owed to the reduced looping downtime provided by Tamamo-no-Mae’s NP (notably when used early on with Kaleidoscope), as well as the enemies’ relatively low HP bars which allows for more consistency through Overgauges. Scathach=Skadi compositions will generally take two or more skill use rotations to finish the stage, while Merlin-supported Buster compositions generally take the longest (though with more stability compared to Skadi ones).
• Using AoE damage dealers are a must for this stage, as single-target ones will be limited in effectiveness thanks to the many Break bars. Servants with affinity towards looping should be used for both Quick (Edmond Dantes, Achilles) and Arts (Katsushika Hokusai, Jeanne d’Arc (Archer)), while the choice for Buster is generally more flexible, as long as the Servant deals sufficient NP damage to deal with enemies in time. It is a good idea to have a back-up damage dealer for Servants whose class disadvantage is featured in the stage.
• A large variety of supports can be used for this stage. Scathach=Skadi, Merlin, Tamamo-no-Mae, and Zhuge Liang are all no-brainers, but Servants such as Helena Blavatsky, Gilgamesh (Caster) and Paracelsus von Hohenheim are also very powerful choices, especially with the method explained right below.
• GUDAGUDA Poster Girl is an extremely powerful CE for this stage, as it allows a buffer to provide buffs for the main damage dealer before tanking Nobunaga’s NP and making way to yet more buffers from the backline. Outrage and Halloween Arrangement can also be used to a similar effect, if a bit more restrictive. Naturally, normal suicide Taunting with Georgios or Leonidas can be utilized as well.
• Low-star Wave-clearer Servants such as Arash and Avicebron are great choices to take care of the enemies’ first Break bars.
• While high-end comps strive to attain stability through the use of supports, low-star oriented runs should instead focus more on continuously dealing damage by using multiple damage dealers, typically accompanied by a couple of Taunters or Last-Stand Servants to make the runs more stable.

• Note that these videos are not affiliated with GamePress, but showcase some lineups that are effective in clearing the final challenge. These can serve as a good reference for how to rotate skills during this quest or simply to have a look at the encounter before diving in.
  • Jeanne d’Arc (NP3) solo
  • Amakusa Shirou (Grailed lv100, NP2) solo*
  • Hokusai 6-turn clear
  • 1-3 stars clear
  • Double Skadi ft. Dantes run
  • Astolfo run (one Skadi)

*Uses Command Codes, may need to be compensated with higher NP level