Sorry for the delayed post, I was busy rushing LB7 in order to access Ordeal Call free quests.
Since a SOLO clear of this CQ is impossible (you can’t break her weak points in a SOLO run, “her” NP almost always removes/ignores defensive buffs and after Britomart’s break you’ll get your weak point destroyed unless you stun her for three consecutive turns) the only feasible challenge is a damage race to clear it in 3 turns.
It’s possible to 3T this CQ using either Buster Crit DPS like Arjuna Alter, Saber Musashi and even OG Artoria or you can rely on Draco’s super effective NP: both strategies can work without using command spells (embracing the corresponding usual RNG for damage and facecards), but unfortunately I can’t replicate them since I lack a strong enough main DPS so I must rely on my support list to get it (for Buster DPS you need double Koyan to double cast your skills and for Draco I’d need NP5 e-sports supports of my own that can buff Draco and die with a couple of hits from Britomart to rotate them).
To summarize this 3T clear is the only one that was available to me (after resetting the support list for about an hour to find a grailed Draco with the damage bonus CE), but on the flip side this is a guaranteed 3T clear without any kind of RNG for facecards or damage: to be fair I need to land Kriemhild and Ganesha’s debuffs bypassing Britomart’s magic resistance (82% chance) if I want to guarantee the damage required even with a min-roll, but I have plenty of RNG resets using Krimhild/Ganesha/Master’s skills to try again if very unlucky (2 resets for Kriemhild and 2 resets for Ganesha to land a 82% chance debuff is more than enough).
![[FGO NA] Illya's Karakuri Castle CQ — Bedivere Setup](https://static.wikia.nocookie.net/a634480d-5d89-4c9d-83c7-64f39af29280/scale-to-width/755)