Accuracy is a term used to define how often a weapon or an attack spell misses in Shilla.
The default for all weapons is 20%, that is, if a weapon had 100 attacks, it'd probably miss 20 on an consistent average.
You can improve this amount by a few ways. One is renting the Polished Monocle, which improves the base accuracy by 15%. So 80/100 becomes like 83/100, or about a 3% increase.
Also, doing various specialty quests for your weapon of choice can improve your accuracy by a few % points per quest, and most specialties have about 3-4 of these quests.
As for attack spells, the base miss rates depend on which Mage's specialty guild you're a member of, such as:
- Wandwielder: 20% base miss rate
- Tomeholder: 10% base miss rate
- Orbmaster: 25% base miss rate
- staff-controllers: ??
By doing various specialty guild quests for your attack spells can improve your spell accuracy by a few % points per quest.