Skill slot

Skill slots are invisible "slots" in weapons, armor and accessories where skills can be placed.

Description
Skill slots allow skill crystals to be attached to equipment. However, this is can only be done by a Master smith (race-specific job for dwarfs who can perform skill crystal fusion).

If a master smith tries to attach an skill crystal into an equipment with no remaining slots, the equipment will break into its raw materials and the skill crystal will be lost.