4th class systems (AP, Traits, new statuses, item crafting)
Translated from the system posts of the Sigma the Fallen blog. When in doubt, the original wins (links in each section).
AP system
Original post · published 2024-05-23, updated 2024-06-18
- On becoming a 4th class, the character gets the AP (Activity Point) bar, below HP and SP.
- Every class has 200 AP; for now there's no way to raise Max AP.
- AP is recovered by using certain 4th class skills (the skill description says "AP recovery") and spent by other 4th class skills ("AP cost").
- Skills that recover AP don't need to hit the enemy: casting is enough. Instant or ground skills recover AP even with no target.
- Recovery depends on casting the skill, not on dealing damage.
- Multi-hit skills recover AP only once, at cast time.
- Entering a PvP/GvG map resets AP to zero.
- Dying resets AP to zero.
- Autocast ignores AP: a skill that recovers AP recovers nothing when autocast, and a skill that costs AP can be autocast without spending AP.
Trait Status
Original post · published 2024-05-19, updated 2024-08-07
In the 4th class, leveling up no longer gives status points for STR/AGI/VIT/INT/DEX/LUK. Instead you get trait status points, spent on 6 new stats:
| Trait | Effect |
|---|---|
| POW (Power) | StatusAtk +5 per point · P.Atk +1 every 3 points |
| STA (Stamina) | Res +1 per point · Res +5 every 3 points (as in the original) |
| WIS (Wisdom) | Mres +1 per point · Mres +5 every 3 points (as in the original) |
| SPL (Spell) | StatusMatk +5 per point · S.Matk +1 every 3 points |
| CON (Concentration) | Hit +2 and Flee +2 per point · P.Atk +1 and S.Matk +1 every 5 points |
| CRT (Creative) | H.Plus +1 per point · C.Rate +1 every 3 points |
- Fixed cost of 1 trait point per point, always.
- On becoming a 4th class: +7 trait points. Each level: +3. Levels that are multiples of 5 (205, 210, 215…) give +7 instead of +3.
- Running total: 197 at lv. 250 · 235 at lv. 260 · 292 at lv. 275.
- Max per trait: 100 (in KRO it went up to 110 with the level 275 patch, on 2024-08-07).
Secondary stats
| Stat | Effect |
|---|---|
| P.Atk (Power Attack) | +1% to StatusAtk, WeaponAtk and EquipAtk per point (doesn't affect MasteryAtk) |
| S.Matk (Spell Magic Attack) | +1% to StatusMatk, WeaponMatk and EquipMatk per point |
| C.Rate (Critical Damage Rate) | +1% added straight to base critical damage (140%). E.g.: C.Rate 10 → 150% critical |
| H.Plus (Heal Plus) | +1% healing per point, calculated before the normal healing multipliers (which don't multiply this bonus) |
| Res (Resistance) | Reduces physical damage, calculated before Def: (2000 + Res) / (2000 + Res × 5) |
| Mres (Magic Resistance) | Reduces magic damage, calculated before Mdef: (2000 + Mres) / (2000 + Mres × 5) |
New negative statuses (4th class patch)
Original post · published 2024-05-19, updated 2024-12-01· author's source: GungHo JP
General rules:
- Base duration of 10 s.
- The related trait reduces the duration by 0.08 s per point.
- Minimum duration of 2 s.
- For all of them, the chance to get the status accounts for the base level difference between the caster and the target.
| Status | Effect | Reduced by | Applied by |
|---|---|---|---|
| Pitch-darkness | Dark fog reduces vision; Flee and Perfect Dodge = 0 | STA | Servant Weapon - Phantom |
| Quiet | Can't use skills; ASPD −50 | SPL | Arbitrium, Hell Tree |
| Lethargy | Reduced movement speed; Cri = 0 | POW | Wooden Warrior, Wooden Fairy |
| Quench | Can't move, use items or skills; becomes Water element; Def −50%, Mdef −50%; ends when hit | CRT | Diamond Storm |
| Torrent | Can't move, use items or skills; becomes Wind element; +25% Earth damage taken; ends when hit | WIS | Lightning Land |
| Concretion | Can't move, use items or skills; becomes Earth element; Mdef = 0; ends when hit | CRT | Terra Drive |
| Blaze | Loses 15% of MaxHP every 3 s (not lethal, stops at 1 HP); becomes Fire element | SPL | Conflagration |
| Unlucky | Hit = 0; 25% chance to fail when using a skill; on monsters, Flee = 0 | CRT | Unlucky Rush, Capriccio of Loki, Hell Tree |
| Severe Poison | Loses 10% of current HP per second (not lethal, stops at 9 HP); Def = 0; +25% Poison damage taken | STA | Venom Swamp, Creeper |
| Gloom | Skills cost 3× more SP; loses 1% SP every 3 s | WIS | Requiem of Niflheim |
Cures crafted by the Biolo (Bionic Pharmacy): Eye Cleaner (pitch-darkness), Ear Cleaner (quiet), Tonic (lethargy), Compressed Fire Extinguisher (blaze), Lucky Water (unlucky), Strong Antidote (severe poison), High Calorie Chocolate (gloom), Refined Holy Water (holy fire). See Biolo.
Amount crafted by Manufacture Machine (Meister) and Bionic Pharmacy (Biolo)
Original post · published 2026-06-01
Manufacture Machine (Meister)
Max per use: 7 + Lv items.
A = DEX/3 + CRT + LUK/3 + base_level/5 + random(50~200) + (base_level − 100) + Lv(Weaponry Research) × 5
B = level_difficulty + item_difficulty
level_difficulty = 700 − Lv(Manufacture Machine) × 100
item_difficulty: Machine Capsule, ABR Capsule = 30| A − B | Items received |
|---|---|
| ≥ 400 | max |
| 300 ~ 399 | max − 4 |
| 100 ~ 299 | max − 5 |
| 1 ~ 99 | max − 6 |
| ≤ 0 | max − 7 |
Bionic Pharmacy (Biolo)
Max per use: 10 + Lv items.
A = INT/3 + CRT + LUK/3 + base_level/5 + random(50~200) + (base_level − 100) + Lv(Learning Potion) × 5
B = level_difficulty + item_difficulty
level_difficulty = 700 − Lv(Bionic Pharmacy) × 100
item_difficulty: Acid Bottle (all) = 30 · Advanced Coating Potion, Greater Plant Bottle = 50 · status cures = 100| A − B | Items received |
|---|---|
| ≥ 550 | max |
| 450 ~ 549 | max − 3 |
| 200 ~ 499 | max − 5 (sic: the original overlaps with the range above) |
| 1 ~ 199 | max − 6 |
| ≤ 0 | max − 7 |
KRO dev note Q4/2024: announced new skills
Original post · published 2024-09-30· author's source: KRO dev note
Announcement of 14 new skills for 4th and expanded classes. The final versions (with formulas) came later in the 275/60 patch: see novas-skills-patch-275-60.md.
| Class | Skill | Announcement summary |
|---|---|---|
| Dragon Knight | Dragonic Pierce | Two-handed spear only; ranged physical, single target; can crit; stronger under Dragonic Aura |
| Imperial Guard | Imperial Pressure | Neutral magic, area; becomes Holy with Guard Stance |
| Abyss Chaser | Abyss Flame | Fire magic, area, 5 hits, plus a 3-hit packet around the caster |
| Arch Mage | Energy Conversion | Converts the caster's AP into SP |
| Elemental Master | Psychic Stream | Dashes to the target; Neutral magic, area; costs AP; not usable with Energy Coat |
| Cardinal | Divinus Flos | Holy magic, area; becomes Neutral with Ancilla |
| Inquisitor | Thermal Bomb (released as Blazing Flaming Blast) | Ranged physical, single target; can crit; Fury only; stronger with the Massive Flame Blaster buff |
| Windhawk | Wild Walk | Falcon attack, ranged physical; can crit; then gives a speed and Flee buff; costs AP; usable on the Warg |
| Sky Emperor | 3 skills (Korean names 천기신양 / 천기신월 / 천성지행; released as Sky Sun, Sky Moon, Star Light Kick) | Celestial unity only (Enchanting Sky): melee physical around with crits; physical area; leap to the target with area damage |
| Hyper Novice | Overcoming Crisis | Spends AP for a self buff of MaxHP, P.Atk and S.Matk |
| Spirit Handler | Chulho ??? (released as Chulho Battering) | Ranged physical, area; can crit |
| Spirit Handler | Hyunrok ??? (released as Hyunrok Spirit Power) | Magic, area, Neutral by default, element changeable with Colors of Hyunrok |