This is mostly a standard battle, build up your NP here to make the second wave easier.
Regardless of the final enemy's class, it's fine to bring an AOE Archer.
Using Mystic Code Chaldea Combat Uniform for this whole battle is recommended.
Battle 2
Similar to the first wave, but beware of the Demon. If you're using a Caster to support/sustain, it can do a serious damage to your Caster.
Battle 3
The final use of your Archer in here is to let out their AOE NP to wipe out or weaken the Sabers surrounding Scathach. After that, it's fine if they die.
Scathach's HP is seriously high and she can occasionally put in Evade, and her NP will stun her target. Because of this, the battle can take a very long time, even with an all-Saber team.
Strategies and Recommended Servants
As stated, you should start early with AOE Archers, even better if they could generate NP well. However, keep a single-target NP Saber around to eventually deal with Scathach.
During the last stages, if you actually used the Chaldea Combat Uniform, you can switch out members as necessary.
Servants that can apply Sure-Hit are recommended in case Scathach activates her Evade. If you don't have that, you can use CEs that grant the user Sure-Hit.
A taunting Servant can be useful when Scathach is about to use her NP. Even better if the Servant is a Saber.
This battle is best for farming Vacuum Tubes, therefore have at least one of your Servants equipping the CE . Due to the strength of the enemy here, you may consider putting on one of your fighters here.
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NOTE: Unlike the Edmond Dantes Event, this kind of battle is repeatable. So if you have more than one strategy, let us know.