3rd Anniversary: Singularity F Memorial Quest

Quest Overview

Clear all other 3rd Anniversary Memorial Quests to unlock.
This encounter is identical to the 2nd Anniversary and FGO USA Tour Singularity F Memorial Quest.
See the below for an in-depth guide for this encounter.

Part 1

Grand Battle 1/1
Enemies	HP	Lvl
Altria Pendragon (Alter) Prioritizes Caster-Class targets.	648,477 BreakBar1 BreakBar2	80
Altria Pendragon (Alter) Prioritizes Caster-Class targets. Upon 1st break: Defender of Humanity: Charge NP gauge by 1. Decrease own DEF by 20% (5 turns) [Demerit]. Apply Debuff on ATK: 50% chance to decrease target's DEF -20% during normal attacks (3 turns, can stack). *Can avoid this if Altria Pendragon (Alter) is stunned on the same turn as her HP Bar is broken.	939,965 BreakBar1 BreakBar0	85
Altria Pendragon (Alter) Prioritizes Caster-Class targets. Upon 2nd break: Defender of Humanity: Charge NP gauge by 1. Decrease own DEF by 20% (5 turns) [Demerit]. Apply Debuff on ATK: 50% chance to decrease target's DEF -20% during normal attacks (3 turns, can stack). *Can avoid this if Altria Pendragon (Alter) is stunned on the same turn as her HP Bar is broken.	1,537,986 BreakBar0 BreakBar0	90