There are two variations for this build:
Heal Thief is used to replace a healer completely. This can provide a reasonable amount of healing with and . This can be used as the sole healer for organized squads but it may prove difficult to maintain your squad if everyone isn't familiar with the encounter.
Boon Thief is used in low pressure encounters and can provide somewhat decent DPS.
These builds are used exclusively at 
Mursaat Overseer and 
Matthias, due to the 
Stolen Skill; 
Detonate Plasma. Outside of these encounters, these builds will not see the light of day.
There are two key traits that make these builds work:
will grant you two 
Detonate Plasmas when you and will reset a random skill category when you . You have three skill categories with this build, however it can reset skill categories that you currently don't have equipped. You will only have three out of the five skill categories on your bar at one time:
Cooldown. This Cooldown is only associated with the skill 
Recharge part and not the double .
will reduce the Recharge on your by 50% when you 
Dodge or 
Evade an attack while wielding a Sword. This comes with a 10 second Cooldown.
When you are playing either build, you can heal with . Heal Thief also has access to for an additional heal.
is taken on the Heal Thief build to help your 
Condition Mirages apply more 
Confusion. is a Smoke field that will inflict 
Blind when Whirl finishers are used e.g. . Due to the trait , Blind will inflict Confusion.
can also be frequently used to provide another Smoke field for the Condition Mirages.
is a Dark field that will inflict Blind when Leap finishers are used e.g. .
Detonate Plasma is an amazing Stolen Skill that provides all boons to your entire squad except for 
Alacrity. You gain 10 seconds of each boon except for:
Retaliation = five seconds.
Stability = eight seconds.
Resistance = three seconds.
Quickness = four seconds.Alacrity = zero seconds :(Detonate Plasma from the following encounters:
Matthias.
Keep Construct.Mursaat Overseer.
Broken King, Eater of Souls and the two Eyes.
Kenut.
Hydra, 
Matriarch and Pyres at 
Qadim.
The duration of these boons assumes no 
Boon Duration.
causes you and four allies to heal yourselves with your next five attacks. Make sure you have four other people inside the relatively small AoE before using this skill.
is a Dark field, applies 
Stealth and will pulse heal allies. This utility will also revive up to five downed allies by 5% per pulse, for a maximum of five pulses.
is used to provide 300 
Breakbar damage. This is only useful at Matthias, you should never take this at Mursaat Overseer.
is a Smoke field that will benefit your Condition Mirages. You will need to take care when you use this at Matthias as it also blocks projectiles.
causes you and four allies to deal 150 Breakbar damage on your next attack. Make sure you have four other people inside the relatively small AoE before using this skill. This is only useful at Matthias, you should never take this at Mursaat Overseer.
grants you + 180 
Precision. You can also use the active of to cleanse three conditions, only do this if you know you will die.
grants you + 180 
Power. The active of this skill will grant you + 540 Power for five seconds.
causes you and four allies to apply 
Poison for the next six attacks. Make sure you have four other people inside the relatively small AoE before using this skill.
provides you with some DPS but you should only take this utility when there are no 
Breakbars in the encounter. This is only useful at Mursaat Overseer, you should never take this at Matthias.
Deadly Arts Trait Line
causes your to apply Poison.
causes you to gain + 160 Power on this build. It also has a 33% chance to cause Poison when you hit with a dagger skill. This only applies when playing Boon Thief.
will provide you with a moderate self-heal when you . This only applies to Heal Thief.
causes you to apply 
Immobilize to a target if you strike them when their health is below 50%. This part of the trait has a 20 second Cooldown. This trait also causes your Immobilize to apply Poison with an internal Cooldown. This works in great synergy with .
causes you to do 2% more damage per unique condition on your target. Typically, you will have between 10 - 11 conditions on a target. This only applies to physical damage.
will grant you two Detonate Plasmas when you and will reset a random skill category when you . You have three skill categories with this build:
Cooldown.
Acrobatics Trait Line
grants a two second Evade when your health drops below 50%. This comes with a 40 second Cooldown.
grants you 
Vigor when you successfully Evade an attack. This is fairly redundant as you will have permanent Vigor from Detonate Plasma.
will reduce the Recharge on your by 50% when you Dodge or Evade an attack while wielding a Sword. This comes with a 10 second Cooldown.
improves the effects of Vigor by 50%. It will also grant you + 240 
Concentration.
will grant you 
Regeneration and one point of 
Initiative when you Evade an attack. This only applies to Heal Thief.
will heal you for each point of Initiative spent. This only applies to Boon Thief.
Trickery Trait Line
This only applies when you are playing Heal Thief.
causes you to gain two Initiative whenever you .
will cause you to leave from the position in which you 
Dodged from.
increases your Initiative by three.
causes you to apply 
Torment when you interupt at enemy. Your will cause 
Daze due to .
causes you to gain one stack after each skill that uses Initiative is completed. You will not gain a stack of if the skill is not completed. Each stack of increases your phyiscal damage and 
Condition Damage by 1% with each stack lasting 10 seconds. This trait also reduces the Recharge of your by 15%.
causes your to have a reduced Recharge of 20%. This synergizes well with , , and .
Critical Strikes Trait Line
This only applies when you are playing Boon Thief.
gives you an additional 5% 
Critical Chance when your health is above 90%.
gives you an additional 7% Critical Chance when you hit your target from the side or behind. You also gain 7% 
Critical Damage when your health is above 90%.
causes you to deal 5% more damage to enemies suffering from 
Cripple. This should be a permanent bonus.
causes you to deal 10% additional damage when your target is above 50% health.
causes 
Fury to give you + 250 
Ferocity on top of the native 20% Critical Chance.
Breakbars
Matthias Gabrel
25,953,840
1,374
140
2,500
If you can, ask your squad to let you use and then reset the encounter. This will allow you to immediately pop boons at the start of the encounter and again.
There are a wide range of attacks that you can Evade with :
Evade, but these will be the big ones.
Don't at the 40% phase change. Matthias is 
Invulnerable and your will not work!
Use to help provide your Condition Mirages with a Smoke field for additional 
Blinds. Don't use it when Matthias uses or you will block the projectiles.
Use and to help heal up your squad.
Breakbar Phase
Use , and to help CC.
Mursaat Overseer
22,021,440
1,374
160
If you can, ask your squad to let you use and then reset the encounter. This will allow you to immediately pop boons at the start of the encounter and again.
You can Evade or Dodge the yellow, unclaimed tiles at Mursaat Overseer. This will help reset your Cooldown due to .
You can use to Evade.
2,748
1,374