Useful Servant

What you mainly want is a balance of really good single target NP and useful support servants. Jeanne Alter is one of the best you can get for this Singularity, as are Ozy and Quetz, though others can still do well. With those servants, you will probably want to have Merlin or Waver, with both together being the best support you could ask for. If you dont want to have a hard time with the boss fights, read the guides, as these fights are like Camelot all over again, each one having specific conditions that just screw around with any setup.

Suggestions:
- A good ST Cavalry or Avenger DPS: Ozy, Quetz, Jack, Jalter, ect.
- One Servant to deal with the boss's Turn 1 Invincibility-piercing ultra-buffed NP. Skill Seal is ideal to prevent the NP charge in the first place (Benkei and Mata Hari, David w/ NP), but lacking that, you can use buff block/NP seal (Mephistopheles, and Jalter and Ozy w/ NP). The alternative is to let your front line die, but that's inefficient when the above options are available.
- Two good supports to buff your DPS. Some combination of Merlin, Waver, Tamamo, CasGil, Hans, Shakespeare, Helena, ect.
- Some form of team invincibility (could be in the backline, switched in w/ Combat Uniform) for his subsequent NPs, 'cause at 1.5 million HP you're unlikely to kill him before he NPs again. So Merlin, David, Tristan, ect.
- Optional: Solo unit at the very back to mop up in case everyone else dies. Herc and Cu Alter are ideal for this, though you can put another cavalry unit with starting NP CE.