Sealed Dynasty Breast Plate Piece

How to get

Monster	Lv	How	Quantity	Chance
Gorgolos boss	82	drop	2–6	41.1%
Queen Shyeed boss	84	drop	2–6	30.5%
Gwindorr boss	83	drop	2–6	30%
Lesser Giant Scout	82	spoil	1	7.1%
Nihil Invader Disciple	82	spoil	1	4.08%
Mutant Assassin	84	spoil	1	3.42%
Spiked Stakato Drone	83	spoil	1	2.57%
Spiked Stakato Nurse	83	spoil	1	2.54%
Cannibalistic Stakato Follower	82	spoil	1	2.51%
Spiked Stakato Sorcerer	82	spoil	1	2.48%
Invader Healer of Nightmare	81	spoil	1	2.33%
Nihil Invader Assassin	82	spoil	1	2%
Mutant Elite Soldier	84	drop	1	1.65%
Awakened Mucrokian	84	spoil	1	1.62%
Invader Soldier of Nightmare	81	spoil	1	0.5949%
Varangka's Dre Vanul	81	spoil	1	0.5077%
Nihil Invader Disciple	82	drop	1	0.5023%
Varangka's Destroyer	82	spoil	1	0.4703%
Servitor of Darkness	82	spoil	1	0.4443%
Grave Robber Summoner	81	spoil	1	0.4131%
Spiked Stakato Sorcerer	82	drop	1	0.3052%
Contaminated Batur Warrior	81	drop	1	0.208%
Elder Lavasaurus	78	drop	1	0.2009%
Gamlin	81	drop	1	0.0911%
Invader Soldier of Nightmare	81	drop	1	0.0732%
Ragna Orc Warrior	82	drop	1	0.0644%
Grave Robber Worker	81	drop	1	0.0533%

Chances are from the server scripts, without the server rates.