At this point, the enemies will not be using 4-digits HP again, but tread with care.
This one has a bigger jump in HP, but you can take this.
The enemy performs AoE normal attacks, meaning that Taunt-oriented teams are not recommended for this stage.
Strategies & Recommended Servants
Since the enemies are all-Assassins, a team of majorly Casters are recommended. But due to Casters' inherently low attack, you may need to put your other damage dealers, but not Berserkers, since they will be susceptible for the final enemy's AoE normal attacks and no Taunts can save them.
The battle with the final enemy is a matter of endurance, so sustain yourself well with healing.
Zhuge Liang is particularly good because of his party-wide Damage Cut skill can help mitigate the AoE damage.
While not a Caster, Mash's defensive buffs can come in handy.
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This battle is WAY tougher than I thought. You can tank the first wave with a team of Casters, but it will leave your team undermanned in the next round since they have low attack scores.
In the first wave, your efforts to gather NP will be hindered with many many Terror skills by the Ghost, so I opted to have a Buster to eliminate them quickly (Heracles). And even I still take damage.
That said, if you have a Buster, that's where Hans and Mash come in to sustain and protect them
At this point, you can use your Command Spells as necessary to either charge up your NP bar or restore HP/
In the second wave, the enemy has huge HP and attacks in AOE. In here, the attention shifts into critical-hitting the enemy. However, even sometimes, the enemy gets lucky and cast Invincible. Dantes could only at least bypass it once.
If you still have Mash, remember that her NP is a lifesaver for 3 turns
I ended up having to use one quartz to revive my team after Brynhild was that close to eliminate the Ghost solo, and cleared the battle.