Class skills in Old School TERA Online (OSTO) are learned on a different schedule than in original/retail TERA—core abilities unlock much earlier, and most classes gain access to their full kit by around level 20. This accelerated progression is meant to let players enjoy their full class identity and rotations sooner, while still keeping the overall experience grounded in a classic level‑60 environment.

Additionally, OSTO has introduced a small set of quality‑of‑life updates to skills/chained skills, which are summarized in the Class Balance Adjustments patch notes.

Class Balance Adjustments

Archer (24 total)

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Level Skill Description
1 Arrow Shoot an arrow at a target up to [maxDistance] away. [PVP] Reduced damage at max distance.
1 Backstep Quickly back up out of harm's way.
2 Arrow Volley Press the skill button once and mouse over to lock on up to $maxCount targets within [maxDistance], then press the skill button again or left-click to shoot at all targets.
4 Penetrating Arrow Charge up the arrow's damage by holding down the skill button, then shoot the arrow at up to $pierceDepth targets in a [maxDistance] line by releasing the button. Arrow shoots when you release the button. Only charges to one level. [PVP] Reduced damage at max distance.
6 Final Salvo Hold down the skill button to shoot up to 5 arrows [maxDistance] away. Does less damage at maximum range. You can use it as a chain skill only after Radiant Arrow, Penetrating Arrow, or Thunderbolt.
6 Slow Trap Set a trap that briefly slows the victim's movement speed by $value. The trap lasts for 15 seconds or until triggered.
8 Close Quarters Strike a foe in front of you. Press the skill button twice to make a second attack that may stun the foe.
8 Feign Death Deceive monsters by pretending to be dead. This resets all aggro on you. You can feign death for up to [time]. Ends when you use a skill or take damage.
10 Breakaway Bolt Shoot an explosive arrow that damages targets within [maxDistance], then step backward.
12 Eagle's Eye Increase power by 30, attack speed by 4 and endurance by 4. Increases damage to monsters by 10%. Cannot be used in conjunction with Sniper's Eye.
12 Retaliate Leap to your feet while attacking your target. You can use this skill only when knocked down. You become briefly immune to knockdown, stagger, and stuns.
12 Sniper's Eye Increase power by 30, attack speed by 4 and movement speed by 8. Increases damage to boss monsters by 5%. Cannot be used in conjunction with Eagle's Eye.
12 Web Arrow Shoot an arrow up to [maxDistance], inflicting damage and slowing the target's movement speed by $value for [time]. [PVP] Reduced damage at max distance.
14 Rapid Fire Hold down the skill button to quickly fire up to 7 arrows [maxDistance] away. [PVP] Reduced damage at max distance.
16 Incendiary Trap Set a trap that damages the victim that steps on it and others nearby. The trap lasts for 12 seconds or until triggered.
16 Restraining Arrow Shoots an arrow up to [maxDistance], decreasing the target's movement speed by $value2 and attack speed by $value for a short time. [PVP] Reduced damage at max distance.
16 Stunning Trap Set a trap that briefly stuns the victim. The trap lasts for 20 seconds or until triggered.
18 Radiant Arrow Charge up the arrow's damage by holding down the skill button, then shoot the arrow up to [maxDistance] by releasing the button. Only charges to one level. [PVP] Reduced damage at max distance.
22 Poison Arrow Shoot an arrow dripping with lethal poison. The arrow flies [maxDistance], inflicting damage to the target and additionally inflicting $value damage every $tickInterval for [time]. Can be stacked up to 3 times. [PVP] Reduced damage at max distance.
30 Rain of Arrows Shoot arrows into the sky; they descend $offsetDistance away and damage targets in the circle where they land.
30 Velik's Mark Mark a target within [maxDistance] for [time]. You deal 20% more damage to the marked target.
60 Concussion Trap Launch a trap 15m in front of you. The trap lasts for 10 seconds or until triggered. Briefly stuns the target and surrounding enemies.
60 Ensnaring Trap Launch a trap 15m in front of you. The trap lasts for 10 seconds or until triggered. Briefly slows down the target and surrounding enemies.
60 Explosion Trap Launch a trap 15m in front of you. The trap lasts for 10 seconds or until triggered. Inflicts explosion damage on the target and surrounding enemies.

Berserker (21 total)

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Level Skill Description
1 Axe Block Block frontal attacks with your weapon. Damage blocked depends on your weapon's stats. Remains active as long as you hold down the skill button.
1 Combo Attack Strike one or more targets in front of you, and gain MP with each hit. Successive strikes do more damage, up to four hits, with the fourth hit dealing substantially more.
2 Cyclone Charge up your attack by holding down the skill button, then release it to spin your axe in a circle. Only charges to one level.
2 Thunder Strike Charge up your axe by holding down the skill button, then release it to attack. Only charges to one level.
4 Dash Increase your speed by $value for [time].
4 Evasive Smash Interrupt a charging skill with an evasive roll then follow up with an uppercut rib-rattling attack. The evasive roll requires one press of the skill button. The smash requires another press of the skill button immediately after. The smash's damage varies based on the level of the charging skill interrupted.
4 Fiery Rage Harness inner rage to increase your Power by $value and decrease your Endurance by $value2 for [time].
4 Flatten Pound the ground, knocking down targets within [maxDistance].
6 Retaliate Leap to your feet while attacking your target. You can use this skill only when knocked down. You become briefly immune to knockdown, stagger, and stuns.
10 Staggering Strike Make a sweeping attack that briefly stuns and turns your target around.
10 Triumphant Shout Instantly restore $mpDiff MP. Your MP doesn't decay for [time].
14 Leaping Strike Jump at your foe and smash downward. Knocked-down foes take 5x damage once you learn Merciless Leap.
16 Fearsome Shout Monsters within [maxDistance] briefly run away from you. Fear effect ends if target is knocked down. In PvP, Fear effect ends if target is attacked.
16 Flurry of Blows Your attack and charging speed increases by $value for [time].
16 Lethal Strike Charge up your attack by holding down the skill button, then release it to attack. Costs HP to use, not MP. Only charges to one level.
16 Mocking Shout Your warlike shout has a chance of staggering enemies within [maxDistance]. You become immune to knockdown and stagger for [time], while greatly increasing your resistance to weakening effects.
16 Vampiric Blow Charge up your axe by holding down the skill button, then release it to attack. A portion of the damage returns to you as healing. Only charges to one level. Activates faster but with less healing if you first overcharge Thunder Strike, Cyclone, or Lethal Strike.
18 Bloodlust Your Power increases by $value; your Balance Factor and Impact Factor increase by $value3. In PvP, skill damage increases by $value2. Lasts [time].
20 Tenacity Call on inner reserves to instantly replenish $mpDiff MP. Briefly increases resistance to stun immensely.
22 Inescapable Doom Briefly slows movement of targets within [maxDistance] radius by $value. Prevents other players from using evasive and movement skills.
30 Unchained Anger Sacrifice HP to gain $mpDiff MP.

Lancer (24 total)

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Level Skill Description
1 Backstep Quickly back up without turning around.
1 Combo Attack Strike one or more targets in front of you, and gain MP with each hit. Successive strikes do more damage, up to three hits, with the third hit dealing substantially more.
1 Stand Fast Block frontal attacks with your shield. Damage reduction depends on your equipment. Reduces damage as long as you hold down the skill button. Allies behind you also get damage reduction.
2 Shield Barrage Move forward, attacking target with your shield. Repeat the attack up to 2 hits, and the last hit may briefly stun your target.
4 Spring Attack Leap to your foe and strike a hard blow. Activates faster if you first use Shield Bash, Shield Barrage, or the third consecutive hit of Combo Attack.
6 Shield Bash Briefly stun one or more foes.
8 Charging Lunge Charge a short distance and impale your target.
12 Debilitate Briefly weaken the Endurance of your foes by $value. Effect stacks up to three times. In PvP, also decreases your foe's HP recovery by 50% at any number of stacks.
12 Retaliate Leap to your feet while attacking your target. You can use this skill only when knocked down. You become briefly immune to knockdown, stagger, and stuns.
12 Wallop Jump forward and hammer the ground with your shield to inflict damage with a chance of stunning your targets. Activates faster if you first use Charging Lunge, Shield Barrage, Debilitate, Shield Counter, or Spring Attack.
14 Second Wind Recovers $hpDiff HP and 750 Resolve.
16 Leash Throw a magical hook and chain that pulls one enemy within [maxDistance] toward you. Not effective on huge opponents.
16 Shield Counter Gain a chance to shield-thump your foe while using the Stand Fast skill. You can't be knocked down or staggered, and you take half damage while using the skill.
17 Adrenaline Rush Your attack speed increases by $value for [time].
18 Challenging Shout Draw the attention of enemies within [maxDistance], increasing their aggro toward you.
20 Chained Leash Throw a chain around a target within 15m and pull up to 6 enemies within 15m together into a tight group. Chained Leash stuns the target.
20 Guardian Shout Adds 91% to endurance of other group members within 20m for [time]. Does not apply to you. Effect ends if you are knocked down.
20 Lockdown Blow Deliver a crippling attack in front of you, briefly decreasing the target's run speed by $value.
20 Onslaught Rush your foe and lunge repeatedly. You are less likely to be knocked down or staggered, and you take only half damage while using this skill. Activates faster if you first use Shield Bash.
32 Menacing Wave Blast a wave that briefly decreases movement and attack speed of all targets within [maxDistance] by $value.
36 Iron Will Your iron will absorbs $value damage, consuming 1 MP for every 20 damage absorbed. Effect ends when you absorb damage beyond the limit, when you run out of MP, or after [time].
42 Master's Leash Throw another hook to pull the target nearer. You can use this skill only after using Leash.
50 Infuriate Infuriate all monsters within [maxDistance] and increase your aggro to the maximum amount.
56 Pledge of Protection Absorb 35% of damage done to other group members within 20m for [time] by taking it on yourself. Your defense determines how much damage you take.

Mystic (34 total)

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