Bozzetto High Vicar cannot be killed in Difficult and Very Difficult Ambuscade

[Nadie]

Platform: Windows
ISP: Unknown
Type of Internet Connection: Unknown
Internet Connection Speed: Unknown
Date & Time: 10th of May 20:00 GMT+2 to 22:00
Frequency: Always
Character Name:
Race: Mithra
World: Valefor
Main Job: Blue Mage
Support Job: Warrior
Area and Coordinates: Legion (?-?)
Party or Solo: Party with 6 members
NPC Name: None
Monster Name: Bozzetto High Vicar
Steps:
1. Enter Intense Ambuscade on Difficult or Very Difficult difficulties (issue does not occur on Normal difficulty).
2. Fight Bozzetto High Vicar until it uses Benediction.
3. Proceed to fight it it until it reaches 1%.
4. At this point, Bozzetto High Vicar will take 0 damage from all sources of damage and under all conditions and is unable to be killed.