TL;DR: A Special Ability (SA) adds a permanent effect to your weapon at a guaranteed 100% success rate through the Blacksmith of Mammon. Focus rules physical DDs and archers, Acumen is mandatory for mages, Haste suits slow weapons and Health is the tank pick. You only pay Gemstones of the weapon's grade.

Overview

A Special Ability (SA) bakes a special effect into your weapon. The Blacksmith of Mammon performs the insertion. SA is available on B-grade weapons and above, and each weapon offers a choice of 2-3 different SAs.

Adding an SA

Find the Blacksmith of Mammon. He spawns in the Catacombs and Necropolis whenever the Dawn side wins the Seven Signs. Pick your weapon and an SA from the available list, then pay the materials by grade:

Weapon gradeMaterialAmount
B-gradeGemstone B10-20
A-gradeGemstone A10-20
S-gradeGemstone S10-20

The exact amount depends on the weapon type. The SA is added at a 100% success rate, so there is no failure. Want to swap your SA? Visit the Blacksmith again, but the previous SA is removed. Crystallizing the weapon destroys the SA with it, while enchanting and the SA do not affect each other.

Popular SAs

SAEffectBest for
FocusCritical ratePhysical DDs and archers
HasteAtk. SpdClasses with slow weapons (two-handed swords)
AcumenCasting SpeedMages (mandatory)
HealthMax HPTanks
Mana UpMax MPMana-hungry classes
GuidanceAccuracyArchers and fights vs evasion classes
EvasionEvasionDagger DDs (Treasure Hunter, Plainswalker)

Class Recommendations

RoleExamplesRecommended SA
Melee fightersGladiator, Tyrant, DestroyerFocus or Haste, depending on your combat style
ArchersHawkeye, Silver Ranger, Phantom RangerFocus โ€” bow criticals deal enormous damage
MagesSorcerer, Spellhowler, NecromancerAcumen โ€” faster casting is critical for you
TanksPaladin, Dark Avenger, Shillien TemplarHealth โ€” more HP means more survivability
Healers / buffersBishop, Prophet, WarcryerAcumen for faster heals or Mana Up to save MP

The SA system follows the standard mechanics across the game world. To deepen the effect on your weapon, pair your SA with augmentation and the attribute system for the strongest possible setup.