Meta skills

Meta skills are skills that are primarily or exclusively intended to affect the use of other skills, rather than actions themselves.

Current Skills

Meta Skill	Dependent Skill(s)
Missile Mastery skill	Bows skill, Crossbows skill, Light Thrown skill, Heavy Thrown skill
Melee Mastery skill	All melee weapons.
Primary Magic skill	All magic skills, though it does not enhance Targeted Magic accuracy.
Sorcery skill	As per Primary Magic, when casting Sorceries.
Offhand Weapon skill	All single-handed melee and thrown weapon skills, excluding Brawling.

With the exception of Offhand, these skills all provide a bonus to their related skills, so long as the meta skill is higher. It is currently unknown how much of a bonus is provided.

Offhand Weapon

Offhand weapon acts in the reverse fashion, lowering the effective skill of a weapon if it is less than the skill of the weapon used. The effective skill value is 70% Offhand / 30% weapon skill, with the total effectiveness never exceeding the weapon skill. Extra skill with the weapon can offset lack of skill with offhand, but no amount of offhand training can compensate for lack of skill with the weapon.

In addition, while it was at one point stated that Offhand would not affect throwing weapons, currently it both affects and trains the Offhand Weapon skill.

Defending

During times of development, the Defending skill was implied to be the meta skill for armors, though it has never been confirmed.