Lost Ark: Boss Types and Weakness (Endgame)

Lost Ark data mined boss types and weakness'

(Updated: September 18th, 2024)

Why this matters?

Boss Type

This guide will let you know which Card Catalog Book bonuses you should focus on and which cards you should upgrade to get bonuses as it increases your damage %.

The most important book bonus is Damage vs. Demons as most bosses are demon type. Work first getting that one done, then move to others. But while you are upgrading cards for demon type, many will overlap with other types and you will get increase in other types as well :)

Boss Weakness

This is a bit less important but it can help with which elements some bosses are vulrnerable to. And if some card set is better than other. But in reality right now the best card set is LoS 30.

Work towards getting LoS 30. KLC 30 is more of a prestige and a (scam).

1# Legion Raids

1.1# Valtan

VALTAN

Demon Beast Commander

Gate	Type	Weakness
1	Beast	No weakness
2	Demon	No weakness

1.2# Vykas

VYKAS

Covetous Legion Commander

Gate	Type	Weakness
1	Demon	Holy damage
2	Demon	Holy damage

1.3# Kakul-Saydon

KAKUL SAYDON

Mayhem Legion Commander

Gate	Type	Weakness
1	Demon	No weakness
2	Demon	No weakness
3	Demon	No weakness

1.4# Brelshaza

BRELSHAZA

Phantom Legion Commander

Gate	Sub.	Type	Weakness
1	Ads Fusion Full	Various Matter Matter	None None Earth
2		Demon	Lightning
3		Ancient	Holy
4		Demon	None

1.5# Akkan

AKKAN

Plague Legion Commander

Gate	Sub.	Type	Weakness
1		Undead	None
2		Demon	None
3	Akkan 0x Kartheon	Demon Demon	None None

1.6# Thaemine

THAEMINE

Darkness Legion Commander

Gate	Sub.	Type	Weakness
1		Demon	None
2	Normal Below 135x	Demon Demon	None Earth
3		Demon	None
4		Demon	None

2# Kazeros Raids

2.1# Echidna

ECHIDNA

Former Covetous Legion Commander

Gate	Sub.	Type	Weakness
1	Narkiel Agris	Humanoid Demon	Fire damage Holy damage
2	Echidna Agris Alcaone	Demon Unknown Unknown	No weakness No weakness No weakness

2.2# Aegir

AEGIR

N/A

Gate	Sub.	Type	Weakness
1	Akkan	Demon	No weakness
2	Aegir	Ancient	No weakness

3# Epic Raids

3.1# Behemoth

BEHEMOTH

The Storm Commander

Gate	Type	Weakness
1	Ancient	No weakness
2	Ancient	No weakness

4# Abyssal Dungeons

4.1# Kayangel

KAYANGEL

N/A

Gate	Type	Weakness
1	Humanoid	Dark damage
2	Humanoid	Dark damage
3	Humanoid	Dark damage

4.2# Voldis

VOLDIS

Ivory Tower

Gate	Sub.	Type	Weakness
1		Plant	Fire damage
2	Rakathus Clone	Beast Matter	No weakness No weakness
3		Anctient	No weakness