System and Object Control Authority
The two authorities of a human unit: what they unlock, how they rise, and the thresholds to know.
In the Underworld, every "human unit" has two authorities, readable in its Stacia Window. They decide what you can cast and which weapons obey you. You start like Kirito arriving at the village: System Control Authority 1, Object Control Authority 10.
System Control Authority (SCA)
It governs Sacred Arts: how many elements you hold, how many cores you keep, which commands answer, and element power (1 + SCA / 50).
| SCA | Held elements | Cores |
|---|---|---|
| 1 to 10 | 2 | 1 |
| 11 to 20 | 3 | 2 |
| 21 to 30 | 4 | 3 |
| 31 to 40 | 5 | 4 |
| 41 to 50 | 6 | 5 |
| 51 to 60 | 7 | 6 |
| 61 to 70 | 8 | 7 |
| 71 to 80 | 9 | 8 |
| 81 to 110 | 10 (one per finger, maximum) | 9 to 11 |
| 111 and above | 10 | 12 (maximum) |
Command thresholds:
| SCA | Unlocks |
|---|---|
| 1 | every basic command, Inspect Entire Command List, Wing Shape, Mirror Shape, Transfer Durability |
| 30 | generating several elements at once (…, Ten Times) |
| 40 | [[slime-art-online/remove-core-protection |
| 50 | [[slime-art-online/deep-freeze |
Object Control Authority (OCA)
It governs Divine Objects: their arts only answer if your OCA reaches their Priority, and Release Recollection needs 10 more. It also sets the power of weapon arts: 1 + OCA / 100.
| Weapon | Priority | Enhance Armament | Release Recollection |
|---|---|---|---|
 Frostscale Whip |
44 | OCA 44 | OCA 54 |
 Blue Rose Sword |
45 | OCA 45 | OCA 55 |
 Conflagrate Bow |
45 | OCA 45 | OCA 55 |
 Night Sky Sword |
46 | OCA 46 | OCA 56 |
 Heaven-Piercing Blade |
46 | OCA 46 | OCA 56 |
 Fragrant Olive Sword |
47 | OCA 47 | OCA 57 |
 Time-Splitting Sword |
49 | OCA 49 | OCA 59 |
How they rise
| Action | SCA (XP) | OCA (XP) |
|---|---|---|
| Kill a hostile creature | +2 | +3 |
| Kill any other creature | +1 | +1 |
Discharge, Burst Element, Adhere |
+1 per element (cores included) | — |
| Grand Art | +1 per 2 elements | — |
| Transfer Durability / Remove Core Protection | +2 / +3 | — |
| Deep Freeze, Wing Shape, Mirror Shape | +1 per held element | — |
| Enhance Armament | — | +2 |
| Release Recollection | — | +6 |
Each level costs 8 + 2 × current level points: 190 points to go from SCA 1 to 11, about 2,950 to reach 51. For OCA, it takes about 2,170 points to go from 10 to 45 — hundreds of hostile creatures.
On every level-up a purple message appears above the hotbar ("System Control Authority 12") with an amethyst resonance. Authorities are kept on death.
See also
Blue Rose Sword
Eugeo's sword, carved from eternal ice: every cut chills, and its memory locks a whole battlefield in ice.
Night Sky Sword
Kirito's black sword, carved from the Gigas Cedar: a stream of branches that pierces everything, then a night that drinks the life around.
Fragrant Olive Sword
Alice's sword, Stacia's first immortal object: it scatters into a stream of golden petals that follows your gaze.
Time-Splitting Sword
Bercouli's weapon, once the hand of the great System Clock: its cuts linger in the future, and reach into the past.