Gregorius is a Raid boss in Blue Archive.

In an abandoned underground temple somewhere in Kivotos, an artificial angel manifested by a twisted mystery conducts his eternal choir.

Gregorius is the completed form of the artificial angel Communio Sanctorum, a mysterious entity born from Gematria's experiments. Even now, the monster continues to play the organ in an underground temple. What awaits at the end of the melody, ...no one knows.

Appearances[edit]

<table class="sortable wikitable raidtable"><tr><th>Raid name</th><th></th><th>Period</th><th>Season</th><th>Notes</th></tr>

Communio Sanctorum: Gregorius

07/05/2023 11:00 ~ 07/12/2023 03:59 55 </table>

<table class="sortable wikitable raidtable"><tr><th>Raid name</th><th></th><th>Period</th><th>Season</th><th>Notes</th></tr> Communio Sanctorum: Gregorius 01/02/2024 20:00 ~ 01/09/2024 12:59 52 </table>

Boss Info[edit]

Stats[edit]

Difficulty	Rec. Level	Attack Type	Armor Type	Boss HP	ATK	DEF	CRIT RES	CRIT DMG RES	Stagger Gauge
Normal	17	Normal	Light	1 000 000	150	1 000	200	9 000	400 000
Hard	25	Normal	Light	3 000 000	250	1 000	200	9 000	1 200 000
VeryHard	35	Normal	Light	6 000 000	400	1 000	200	9 000	2 400 000
Hardcore	50	Normal	Light	10 000 000	550	1 000	200	9 000	4 000 000
Extreme	70	Normal	Light	40 000 000	950	1 000	200	9 000	16 000 000
Insane	80	Mystic	Light	140 000 000	3 000	1 000	200	9 000	42 000 000
Torment	90	Mystic	Light	220 000 000	5 000	1 000	200	9 000	66 000 000

Skills[edit]

Icon	Skill Name	Type	Effect
Normal~Extreme
	聖者の囁き Whispers of the Saint	EX	Deal 500% damage to all enemies with guaranteed hit, and reduce their Attack by 40% for 120 seconds.
	厳粛なる悔悟 Solemn Repentance	EX	The effect applied depends on the number of active debuffs on self: ・4 or fewer debuffs: Cleanse 1 debuff from all allies ・5 or more debuffs: Reduce all allies' Attack by 10% for 120 seconds
	グレゴリオ聖歌 Gregorius Chant	EX	Depending on the direction central pipe organ is facing, effect will be applied to all allies or enemies, and the effect of the skill will change each time the skill is used: ・1: The team facing the black pipe side takes 50% more damage for 60 seconds ・2: Cleanse 1 debuff from the entire team facing the white pipe side ・3: The team facing the white pipe side takes 50% more damage for 60 seconds ・4: Cleanse 1 debuff from the entire team facing the black pipe side (Continue from 1st effect after this)
	万人の救恤 Salvation for Everyone	EX	Deal 999999 damage to all enemies. (this attack removes invulnerability effects)
	聖者のしもべのしもべ Servant of the Servants of the Saints	Passive	Apply following effects to self and the choir depending on the number of debuffs that Gregorius possesses: ・Safe (4~5 debuffs): Increase damage taken by 200% ・Warning (2~3 or 6~7 debuffs): Increase damage taken by 100%, increase Attack by 20% ・Danger (0~1 or 8+ debuffs): Increase Attack by 40%
	荘厳なる聖歌隊 Solemn Choir	Passive	The choirs on the left and right sides will have their Attack increased by 100% after completing their chorus in 40 seconds after appearing. When the choir's HP drops below 1%, it will collapse and become unable to attack.
	サンクトゥス Sanctus	Passive	If a debuff that modifies Gregorius's stats is applied, the same effect is replicated on the choir. The choir echoes 100% of damage taken to Gregorius. At the start of a battle, Gregorius's and choir's Attack is reduced by 30% for 30 seconds In the second half of the battle, all the choirs move beside Gregorio and sing. At this time, enemies and allies are gradually strengthened: ・All choirs gain 10% Attack Speed increase every 10 seconds (this effect stacks) ・All enemies, including Special students, gain 300 Cost Recovery 10 seconds (this effect stacks)
	苦難のオルガン The Organ of Suffering	Passive	The central pipe organ can only be attacked by EX skills and rotates 180 degrees when its HP is below 1%. After spinning, it fully recovers HP and cannot be attacked for 30 seconds.

Icon	Skill Name	Type	Effect
Insane
	聖者の囁き Whispers of the Saint	EX	Deal 500% damage to all enemies with guaranteed hit, and reduce their Attack by 40% for 120 seconds.
	厳粛なる悔悟 Solemn Repentance	EX	The effect applied depends on the number of active debuffs on self: ・5 or fewer debuffs: Cleanse 1 debuff from all allies ・6 or more debuffs: Reduce all allies' Attack by 10% for 120 seconds
	グレゴリオ聖歌 Gregorius Chant	EX	Depending on the direction central pipe organ is facing, effect will be applied to all allies or enemies, and the effect of the skill will change each time the skill is used: ・1: The team facing the black pipe side takes 50% more damage for 60 seconds ・2: Cleanse 1 debuff from the entire team facing the white pipe side ・3: The team facing the white pipe side takes 50% more damage for 60 seconds ・4: Cleanse 1 debuff from the entire team facing the black pipe side (Continue from 1st effect after this)
	万人の救恤 Salvation for Everyone	EX	Deal 999999 damage to all enemies. (this attack removes invulnerability effects)
	聖者のしもべのしもべ Servant of the Servants of the Saints	Passive	Apply following effects to self and the choir depending on the number of debuffs that Gregorius possesses: ・Safe (5~6 debuffs): Increase damage taken by 200% ・Warning (3~4 or 7~8 debuffs): Increase damage taken by 100%, increase Attack by 20% ・Danger (0~2 or 9+ debuffs): Increase Attack by 40%
	荘厳なる聖歌隊 Solemn Choir	Passive	The choirs on the left and right sides will have their Attack increased by 100% after completing their chorus in 40 seconds after appearing. When the choir's HP drops below 1%, it will collapse and become unable to attack.
	サンクトゥス Sanctus	Passive	If a debuff that modifies Gregorius's stats is applied, the same effect is replicated on the choir. The choir echoes 100% of damage taken to Gregorius. At the start of a battle, Gregorius's and choir's Attack is reduced by 30% for 30 seconds In the second half of the battle, all the choirs move beside Gregorio and sing. At this time, enemies and allies are gradually strengthened: ・All choirs gain 10% Attack Speed increase every 10 seconds (this effect stacks) ・All enemies, including Special students, gain 300 Cost Recovery 10 seconds (this effect stacks)
	苦難のオルガン The Organ of Suffering	Passive	The central pipe organ can only be attacked by EX skills and rotates 180 degrees when its HP is below 1%. After spinning, it fully recovers HP and cannot be attacked for 30 seconds.

Icon	Skill Name	Type	Effect
Torment
	聖者の囁き Whispers of the Saint	EX	Deal 500% damage to all enemies with guaranteed hit, and reduce their Attack by 40% for 120 seconds.
	厳粛なる悔悟 Solemn Repentance	EX	The effect applied depends on the number of active debuffs on self: ・6 or fewer debuffs: Cleanse 1 debuff from all allies ・7 or more debuffs: Reduce all allies' Attack by 10% for 120 seconds
	グレゴリオ聖歌 Gregorius Chant	EX	Depending on the direction central pipe organ is facing, effect will be applied to all allies or enemies, and the effect of the skill will change each time the skill is used: ・1: The team facing the black pipe side takes 50% more damage for 60 seconds ・2: Cleanse 1 debuff from the entire team facing the white pipe side ・3: The team facing the white pipe side takes 50% more damage for 60 seconds ・4: Cleanse 1 debuff from the entire team facing the black pipe side (Continue from 1st effect after this)
	万人の救恤 Salvation for Everyone	EX	Deal 999999 damage to all enemies. (this attack removes invulnerability effects)
	聖者のしもべのしもべ Servant of the Servants of the Saints	Passive	Apply following effects to self and the choir depending on the number of debuffs that Gregorius possesses: ・Safe (6~7 debuffs): Increase damage taken by 250% ・Warning (4~5 or 8~9 debuffs): Increase damage taken by 100%, increase Attack by 20% ・Danger (0~3 or 10+ debuffs): Increase Attack by 40%
	荘厳なる聖歌隊 Solemn Choir	Passive	The choirs on the left and right sides will have their Attack increased by 100% after completing their chorus in 40 seconds after appearing. When the choir's HP drops below 1%, it will collapse and become unable to attack.
	サンクトゥス Sanctus	Passive	If a debuff that modifies Gregorius's stats is applied, the same effect is replicated on the choir. The choir echoes 100% of damage taken to Gregorius. At the start of a battle, Gregorius's and choir's Attack is reduced by 30% for 30 seconds In the second half of the battle, all the choirs move beside Gregorio and sing. At this time, enemies and allies are gradually strengthened: ・All choirs gain 10% Attack Speed increase every 10 seconds (this effect stacks) ・All enemies, including Special students, gain 300 Cost Recovery 10 seconds (this effect stacks)
	苦難のオルガン The Organ of Suffering	Passive	The central pipe organ can only be attacked by EX skills and rotates 180 degrees when its HP is below 1%. After spinning, it fully recovers HP and cannot be attacked for 30 seconds.

Recommended Units[edit]

Recommended Units
Saki (Swimsuit)	Her EX applies 3 debuffs for 50 seconds, making her one of the best Unit in this raid. Her Sub Skill increases Special student damage, making her very effective with powerful Special attackers like Minori or Nagisa.
Mina	Almost the same as Saki. She really shines with her Normal skill, dealing a lot of damage depending in the actual debuffs.
Miyako (Swimsuit)	Solid tank who works as a nice complement for Saki or Mina. Her low cost EX also stands for 50 seconds but she only applies one debuff.
Mine	Decent tank who can apply up to 4 debuffs, though 2 are tied to her Normal skill.
Aru	Likely the best Striker DPS for this raid.
Koharu	Any invested AOE Healer will be okay in this raid, though be mindful of damage types on Insane or higher. You will need it to stay alive your strikers in the course of the raid.
Minori	The best Special Unit you can have to beat Gregorius in no time. Her AOE EX full charged can deal massive damage to the large groups of targets, especially later on in the fight.
Nagisa	Nagisa has a fairly strong low cost AOE EX and also can apply one defense debuff, albeit with a very short duration.
Hoshino (Swimsuit)	Somewhat less useful here compared to other Light-armor raids, as her buff doesn't work on Special attackers and she's weak to the boss's Mystic attacks on higher difficulties. Still very useful if you're relying on Strikers for damage.
Azusa	Her Normal skill applies a Defense debuff. Deals decent damage but held back by her single-target focus.
Other recommended Units
Yuzu (Maid) Miyu (Swimsuit) Hibiki Cherino

Rewards[edit]

Ranking rewards[edit]

Note that listed brackets are for the Japanese server. Global version has differing bracket sizes depending on the region.

Bracket	Rewards
1~15000	1200 300 575 1 1 1 1
15001~80000	1000 250 500 1 1 1
80001~180000	800 200 425 1 1
180001~∞	600 150 325 1

Cumulative Score Milestones[edit]

250 000:16 500 000:12 750 000:6 6 1 000 000:300k 1 250 000:8 1 500 000:6 1 750 000:3 3 2 000 000:20 2 500 000:4 3 000 000:3 3 500 000:2 2 4 000 000:150 4 500 000:1 5 000 000:1 5 500 000:1 1 6 000 000:20 7 000 000:32 16 8 000 000:24 12 9 000 000:12 12 6 6 10 000 000:500k 150 12 000 000:4 1 14 000 000:3 1 16 000 000:2 2 1 1 18 000 000:20 20 000 000:32 16 22 000 000:24 12 24 000 000:12 12 6 6 26 000 000:1.2M 150 29 000 000:8 2 32 000 000:6 2 35 000 000:4 4 2 2 38 000 000:20 41 000 000:3M 44 000 000:32 16 47 000 000:200 50 000 000:20 60 000 000:8 2 6 2 70 000 000:6 6 4 4 80 000 000:8 2 6 2 90 000 000:20 100 000 000:1.5M 120 000 000:2M 150 000 000:2.5M 180 000 000:3M 210 000 000:32 240 000 000:5 270 000 000:8 310 000 000:1 320 000 000:8 2 6 2 340 000 000:3M 360 000 000:300 380 000 000:12 6 400 000 000:200 420 000 000:3