This chapter is generally easy with straightforward battles. The one that may give you trouble is the final boss, Demon God Halphas, and mostly if you're using an underlevelled party.
Tips and Tricks
Halphas deals extra damage towards Knight classes (Saber, Lancer and Archer) and takes extra damage from Cavalry classes (Rider, Caster, Assassin and Berserker).
However, it does not take decreased damage against Knight classes or deal decreased damage against Cavalry classes.
It gets 3 actions per turn
Its skills can either increase its own critical rate or decreases your party
It can also charge its own NP while reducing your party's Attack and Defense in the same time.
All of his attacks deal damage to all allies, so taunting does not work here. The same goes to his Noble Phantasm. Combined with his tendency to decrease defense and raising his NP power, this can be dangerous if left untended.
Much like Solomon, as long as you bring your Cavalry (or Rulers) classes, you'll be mostly fine.
Try to have a single-target NP Servant of either Rider, Assassin or Caster since it's alone. Ushiwakamaru comes to mind since she can also buff your team
Since you may have access to Amakusa Shirou, he can be used as a substitute to Jeanne, although his use is to debuff Halphas in case it buffed itself too much
If you have sustaining support Servants like Hans Christian Andersen at minimum, you can endure his attacks. Although a more high-class Servant like Zhuge Liang can perform better, if you have him.
Some Riders that can self-sustain like Martha can also be used as support.
Once again, Mash is very good for support due to her defense buffs from NP and Skill.
Nightingale HP:15,221 ATK:12,64110,184 Card:QAABB/A(NP)[NP] Remove Debuff for all allies. Restore HP for all allies. [Overcharge] Decrease NP Strength for all enemies (1 turn) [S1] Restore HP for a single ally [S2] Increase your ATK and DEF against [Humanoid] enemies (3 turns) [S3] Increase Buster Card effectiveness for a single ally (3 turns)
Helena Blavatsky HP:11,882 ATK:10,2968,692 Card:QAAAB/A(NP)[NP] Deal damage to all enemies. [Overcharge] Decrease DEF (3 turns) & Critical Rate (3 turns) & Debuff Resist (3 turns) for all enemies [S1] Increase NP Gauge for all allies [S2] Gain 5 C. Stars each turn for yourself (5 turns). Chance to increase NP Strength by 50% for yourself (1 turn) [S3] Increase Quick Card effectiveness (3 turns) & Arts Card effectiveness (3 turns) & Buster Card effectiveness (3 turns) for all allies
Rama HP:11,993 ATK:8,6929,854 Card:QAABB/B(NP)[NP] Deal damage to a single enemy. [Overcharge] Deal Special Attack damage to [Demonic] enemies [S1] Increase your C. Star Gather Rate (1 turn). Increase your Critical Strength (1 turn) [S2] Increase ATK for all allies (3 turns) [S3] Apply Guts for yourself (3 turns, 1000HP). Restore your HP
Geronimo HP:9,123 ATK:7,9526,857 Card:QAABB/B(NP)[NP] Reduces all enemies' Critical Chance by 20% (3 turns). [Overcharge]Recover all allies' HP. Increase all allies' Debuff Resistance (3 turns) [S1] Increases own Buster card performance for 1 turn. [S2] Increases own Arts card performance for 1 turn. [S3] Increases own Quick card performance for 1 turn.
Billy the Kid HP:9,506 ATK:6,8576,890 Card:QQAAB/Q(NP)[NP] Apply Sure-Hit (Ignore Evade and Invincible) (1 turn). Deal damage to a single enemy. [Overcharge] Decrease Critical Rate for the target (3 turns) [S1] Increase your Critical Strength (1 turn) [S2] Increase your NP Gauge [S3] Apply Evade for yourself (1 turn). Increase your Critical Strength (3 turns)
March 22nd 4:00 - April 5th 3:59
Medb HP:13,968 ATK:12,80510,296 Card:QAABB/B(NP)[NP] Deal damage to a single enemy. [Overcharge]Deal Extra Damage to Males. Decrease their Mental Debuff Resist (3 turns) [S1] Increase your Debuff Resist (3 turns). Restore HP each turn (3 turns). Increase your NP Gauge by 10% (3 turns) [S2] Increase ATK for all allies (3 turns). Increase ATK for Male allies (3 turns). Restore your HP [S3] Chance to afflict Charm to one enemy of [Male] (1 turn)
March 29nd 4:00 - April 12th 3:59
Cu Chulainn (Alter) HP:12,210 ATK:12,805 Card:QABBB/B(NP)[NP] Deals damage to one enemy. [Overcharge]Increases own Attack (1 turn). Increases own Defense (1 turn)[This Effect Activates First.] [S1] Decrease all enemies' Attack and Critical Chance for 3 turns. [S2] Grants self evasion for 2 hits. Increases own defense for 3 turns. [S3] Grants self guts status for 5 turns.
Thomas Edison HP:11,882 ATK:7,952 Card:QAAAB/A(NP)[NP] Deals damage to all enemies. Seal skills (1 turn) & Noble Phantasms (1 turn) for all enemies. [Overcharge] Decrease Critical Rate (3 turns) & decrease ATK (3 turns) for all enemies [S1] Increase your DEF (3 turns) [S2] Gain C. Stars each turn (5 turns). Increase your NP (5 turns) [S3] Incrase NP Overcharge by 2 stage for one ally (1 turn). Increase C. Star Drop Rate (1 turn) for one ally