Tentacle General Sanity Gilles (Gilles de Rais (Caster))
Dr. Evil (Paracelsus von Hohenheim)
Try to focus on Caster Cu Chulainn first, as leaving him unattended will get your party inflicted with his NP.
Like the first battle, focus on Gilles first before going for the rest.
While there is only one enemy, be careful of Paracelsus. He gets multiple actions per turn and one of them is charging his own NP gauge. If you see his gauge just short of one NP charge, take precaution because he could unleash his AoE NP right then and there.
Strategies and Recommended Servants
As your focus is to concentrate on the Caster Servants, it will be beneficial to use Rider classes, preferrably those with Single target NP.
Despite so, Sakata Kintoki (Rider) can be viable as well because the quickness of unleashing his NP may make up for the class neutrality with Lancer, making him easy to clean up.
If you need a Caster (for Support), use one that can drain NP gauge to delay Paracelsus' NP charging.
If you need Sabers, make sure they're one with AoE NP
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