Exploit Weakness.

Assassin passive mastery skill, unlocked at level 6.

Global · 19 Sept 2026

What it does

Increases caster's Critical Hit by Critical. Has a 13720010% chance to increase attack by DamageRatio% and has a 13720005% chance to summon up to 5 clones on landing a Critical Hit. Each clone deals 16 damage and inflicts Insignia that lasts for 10000. (Max 5 Insignia stacks) Clone cooldown: 13720005 Attack increase cooldown: 13720010

Text from the KR/TW client; Global numbers may differ.

Stat effects

Level 2 and 40

Stat	Level 2	Level 40
Critical Hit	275	1,225

Point cost

21 points in total

Skill level	Points	Character level
1	0	6
2	1	6
3	1	9
4	1	12
5	2	15
6	2	18
7	2	21
8	4	24
9	4	27
10	4	30

More Assassin skills

All

Quick Slice Active · level 1 Savage Roar Active · level 1 Shadowstrike Active · level 1 Heightened Sixth Sense Passive · level 1 Dodge Active · level 1 Ambush Active · level 3 Heart Gore Active · level 4 Storm Rampage Active · level 5 Whirlwind Slice Active · level 7 Flash Slice Active · level 8 Apply Poison Passive · level 9 Infiltrate Active · level 10

Data from the Global client build of 19 Sept 2026 ; skill descriptions come from the KR/TW client, so a number inside one can differ on the Global servers — the tables above are Global values . Snapshot taken 30 Sept 2026. AtreiaLegend is an unofficial fan site, not affiliated with or endorsed by NCSOFT. AION and all related content are trademarks of NCSOFT Corporation.