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Becoming Assasin
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To become an Assasin, go to Thief Guild after your Thief reaching job level 40
or more. You have to pay 666 zeny to the Guildmaster and he will
accept you to be an Assasin.

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Assasin Skills
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Katar Mastery
Pre-requisites: None
Active or Passive?: Passive
SP Use: None

Level 1 : ATK +3
Level 2 : ATK +6
Level 3 : ATK +9
Level 4 : ATK +12
Level 5 : ATK +15
Level 6 : ATK +18
Level 7 : ATK +21
Level 8 : ATK +24
Level 9 : ATK +27
Level 10: ATK +30

Comments: Gonna be an Assassin? Then your probably going to use a Katar.
So max this skill ^_^

Right Hand Mastery
Pre-requisites: None
Active or Passive?: Passive
SP Use: None

Level 1 : 55% Damage
Level 2 : 60% Damage
Level 3 : 65% Damage
Level 4 : 70% Damage
Level 5 : 75% Damage
Level 6 : 80% Damage
Level 7 : 85% Damage
Level 8 : 90% Damage
Level 9 : 95% Damage
Level 10: 100% Damage

Comments: Max this before Left Hand, since it has a higher damage ratio.

Left Hand Mastery
Pre-requisites: Level 2 Right Hand Mastery
Active or Passive?: Passive
SP Use: None

Level 1 : 35% Damage
Level 2 : 40% Damage
Level 3 : 45% Damage
Level 4 : 50% Damage
Level 5 : 55% Damage
Level 6 : 60% Damage
Level 7 : 65% Damage
Level 8 : 70% Damage
Level 9 : 75% Damage
Level 10: 80% Damage

Comments: If your going with a Dual Dagger Assassin, you'll want to max this.

Cloaking
Pre-requisites: Level 2 Hiding
Active or Passive?: Active
SP Use: 15 SP

Level 1 : 4 second duration
Level 2 : 5 second duration
Level 3 : 6 second duration
Level 4 : 7 second duration
Level 5 : 8 second duration

Comments: This will allow you to move around invisible, as long as you stay
near the walls. You can use skills like Grim Tooth like invisible.

Sonic Blow
Pre-requisites: Level 4 Katar Mastery
Active or Passive?: Active
SP Use: 12

Level 1 : 125% Damage
Level 2 : 150% Damage
Level 3 : 175% Damage
Level 4 : 200% Damage
Level 5 : 225% Damage
Level 6 : 250% Damage
Level 7 : 275% Damage
Level 8 : 300% Damage
Level 9 : 325% Damage
Level 10: 350% Damage

Note: Thanks to VGMaster88 for correcting me on the damage Sonic Blow does

Note 2: This only works with Katars

Comments: This skill allows you to attack 8 times, very quickly with a Katar.
It's really the only good Thief/Assassin active skill, so it's a good idea to
master it.

Grim Tooth
Pre-requisites: Level 2 Cloaking, Level 5 Sonic Blow
Active or Passive?: Active
SP Use: 2

Level 1 : 1 Square Range
Level 2 : 2 Square Range
Level 3 : 3 Square Range
Level 4 : 4 Square Range
Level 5 : 5 Square Range

Comments: This skill allows you to attack enemies while cloaked. Remember, you cannot move off the wall else you become visible again.

Enchant Poison
Pre-requisites: Level 1 Envenom
Active or Passive?: Active
SP Use: 15

Level 1 : 10 Second Duration
Level 2 : 20 Second Duration
Level 3 : 30 Second Duration
Level 4 : 40 Second Duration
Level 5 : 50 Second Duration
Level 6 : 60 Second Duration
Level 7 : 70 Second Duration
Level 8 : 80 Second Duration
Level 9 : 90 Second Duration
Level 10: 100 Second Duration

Comments: This will give the target weapon a Poison Attribute for a period of
time. Hey, it can be fun...

Poison React
Pre-requisites: Level 3 Enchant Poison
Active or Passive?: Active
SP Use: Varying SP Use

Level 1 : 40 SP per use, 30 second duration
Level 2 : 35 SP per use, 30 second duration
Level 3 : 30 SP per use, 30 second duration
Level 4 : 25 SP per use, 30 second duration
Level 5 : 20 SP per use, 30 second duration

Comments: This skill is a lot more useful than I thought it was. When attacked during the activation period, you have a 50% chance to return the damage as a poison based attack. The spell is terminated then. It's high SP cost makes it so so though.

Venom Dust
Pre-requisites: Level 5 Enchant Poison
Active or Passive?: Active
SP Use: 20, 1 Red Gemstone

Level 1 : 5 Second Duration
Level 2 : 10 Second Duration
Level 3 : 15 Second Duration
Level 4 : 20 Second Duration
Level 5 : 25 Second Duration
Level 6 : 30 Second Duration
Level 7 : 35 Second Duration
Level 8 : 40 Second Duration
Level 9 : 45 Second Duration
Level 10: 50 Second Duration

Comments: Allows you to spread poison gas over a 3x3 area. Any enemy coming in contact with the cloud will be poison. Useless until status ailments are enabled.

Venom Splasher
Pre-requisites: Level 5 Poison React, Level 5 Venom Dust
Active or Passive?: Active
SP Use: ???

Comments: Allows Poison to be spread to enemies, assuming when they near each other. It only works when they have over 1/3rd HP though.