Skill

A Skill is a named grouping of one or more related Abilities — for example, Fishing might group netting and harpooning abilities; Magic might group individual spells.

Skills are not designed top-down as a fixed list handed out in advance. They're discovered bottom-up: abilities get created for whatever gameplay needs them, and once enough exist, related ones get grouped into a named skill.

A skill has no mechanics of its own beyond its member abilities — there's no separate "skill level" resource distinct from the mastery of the abilities inside it. Any skill-wide number (if one is needed, e.g. for gating content) is derived from the mastery of its abilities, exact aggregation to be worked out per skill as needed.

See also Affinity for the separate, optional elemental byproduct some abilities produce.