CBC 2025 - Challenge Guide

Enemy Layout

Requirements: Clear Main Quests, unlocks on ~Day 8.

Boss Statistics

Overview

• Sample the Takasugi Industry's latest products in the Chaldea Boys Collection 2025 Challenge Quest!
• A field effect is present that is part of the central gimmick of this quest, which at base has a 40% chance to provide HP regeneration (1k per turn) buffs to the party each turn.
• This buff comes with a cost - the next turn, Servants will lose 10% NP Gauge and 3 Stars, although they also have a 60% chance to have reduced skill cooldown by 1 turn. Additionally, it gives Servants with the buff the VIP status for 10 turns, which is stackable up to 10 times.
• VIP is not counted as a buff or debuff, so it isn't possible to remove.
• There are a total of four enemies in a single wave, with three present at first: Assassin (104k, 122k, 139k HP), Lancer (176k, 201k HP), and Caster (116k, 142k HP), with the Archer in the backline (181k, 207k, 233k HP).
• The Assassin starts with unremovable 3-turn Taunt, and also buffs DEF for the party every time they take hits.
• On break, they gain a 100k Max HP burr and Crit Rate buffs.
• On second break, they have a Crit Damage buff and start removing 1 buff for each normal attack.
• The Lancer has a special skill used every odd turn, where they can inflict Stun on an enemy. If this succeeds, they also inflict Stun on themselves and drain their own NP charge by 1. Additionally, for the next 10 turns, the chance of the field effect that applies VIP status succeeding increases by 30%.
• On break, they become immune to immobilizing debuffs and NP charge drain effects, including the ones inflicted by his own skill used every other turn. Also, he now passively buffs the VIP status field effect by an additional 30% while on the field.
• The Caster has a special on-death effect that will activate the Archer's on-death effect if she is killed first.
• It can be better to leave her for last to avoid the instant death effect that gets activated if she is killed first.
• On break, she restores all her allies' health by 50% and grants +2 NP charge.
• The Archer, upon entry from the backline, will have two effects:
• He gains ATK and Crit Rate buffs.
• He also will activate an on death buff where if the Caster is killed, then on his own death, all party members with the VIP status effect will instantly die.
• Be careful since if both the Archer and all party members die simultaneously, this still counts as a loss!
• On first break, he inflicts 1-turn Charm on any VIP enemies, and grants allies Ignore Invincibility.
• On second break, he charges his allies' NP Gauge to max, and gives 1-turn Invincibility, along with providing 100% NP charge to any VIP party members and 1-turn Invincibility to them as well. He also gains unremovable 3-time 1 HP Guts.

Team Recommendations

• AoE Archer, Caster, Berserker, or Neutral Class Damage Dealers all make for excellent choices for this battle.
• Morgan is a particularly standout option since all enemies in this battle have Human attribute.

• Guts effects either from Support, CEs, or the damage dealer themselves are very useful for this battle, especially from the back line. It can help the party survive the final Instant Death effect that the enemy Archer inflicts on any VIP party members, which is difficult to avoid in this battle.
• Taunt Support is helpful since the Assassin's break effect allows his normal attacks to remove 1 buff at a time. This can help keep buffs applied on the damage dealer.
• NP Gauge and Damage Support for the damage dealer will help reach damage numbers required to deal with the boss waves. The usual suspects of Castoria, Tamamo, Koyanskaya, Oberon, Skadi/Ruler, Merlin, Reines, and Waver are all great choices.

Video Links

• Note that these videos are not affiliated with GamePress, but showcase some lineups that are effective in clearing the final challenge. These can serve as a good reference for how to rotate skills during this quest or simply to have a look at the encounter before diving in.
• Chen Gong w/ 2x Castoria (1x Guts CE), Tamamo, Assassin of the Nightless City, Rasputin (5 turns)
• Morgan w/ Merlin, Chen Gong, 2x Koyanskaya, Heracles (6 turns)
• Heracles NP5 Lv100 Solo (15 turns)
• Silver Rarity clear: Support Cu Chulainn, Avicebron, Cu Caster, Hassan of the Cursed Arm, Cu Prototype, Cu Chulainn (24 turns)

Quick Servant Suggestions