Default Skills

Players have 3 free Default Skills slots, they can choose from a selection of 10 which skills to bring into an encounter.
Each skill can be upgraded up to level 5, they start at a 6000 Artifact cost and double each level.
The upgrading panel can be found in the Normal Encounters menu by clicking "Customize and Upgrade".
Auto Repair

Grants you a buff that automatically regenerates both your shield and armor by 30 per second for 5 seconds.
Cooldown: 30 seconds
Upgrade: -3 second cooldown
Defense Boost

Reduces incoming basic attack damage by 70% for 5 seconds.
Cooldown: 30 seconds
Upgrade: -3 second cooldown
EMP Blast

Stuns nearby enemies for 2 seconds.
Cooldown: 15 seconds
Upgrade: +1 second of stun per level
Armor Convert

Sacrifice 20% of your shield to regenerate 10% armor.
Cooldown: 9 seconds
Upgrade: +5% conversion
Shield Convert

Sacrifice 20% of your armor to regenerate 10% shield.
Cooldown: 9 seconds
Upgrade: +5% conversion
Missile Launcher

Launches 4 shield penetrating missiles towards random targets. Lasts 5 seconds.
Cooldown: 40 seconds
Upgrade: +2 missiles per level
Restructuring

Randomize all of your existing turrets.
Cooldown: 45 seconds
Upgrade: -3 second cooldown
Stabilizer

Remove stun, slow and burn. Immune to stun for 5 seconds.
Cooldown: 30 seconds
Upgrade: -3 second cooldown
Nullify

Instantly destroy your current target, does not work on Corruptors.
Cooldown: 40 seconds
Upgrade: +5 second cooldown
Mark

Mark a target, causing it to take 50% increased damage from basic attacks, lasts 5 seconds.
Cooldown: 5 seconds
Upgrade: +5 second duration