Skills begin with weapons
The official description ties access to active abilities to your weapons. This makes the weapon system relevant when thinking about which actions a character can use, even though the game does not have a fixed class roster.
That relationship alone does not tell us the full set of skills for each weapon, whether an ability can be used after switching equipment, or how many abilities can be equipped at once.
Modifiers and specializations
The studio names modifiers and specializations as ways to shape how abilities work. They are part of the announced customization model, not a public catalog of named upgrades with costs and damage values.
An explanation of this system should therefore separate the ability you access from the customization you apply to it. Without reliable individual skill records, we cannot recommend particular modifier combinations or compare their performance.
Skill Mastery
The Early Access plan explicitly names Skill Mastery and describes its role in ability upgrades. It also says the system will continue evolving during development. Exact mastery levels, experience requirements and upgrade effects are not documented in this Wiki.
Skills and the passive tree
Active skills and the Passive Skill Tree are separate parts of character building. The official material names both the tree and Skill Mastery; it does not make those terms interchangeable.
Use this page for the active-ability structure and the tree page for the passive layer. Neither establishes a best leveling path. Complete skill names, numbers and demonstrated interactions need public, game-specific evidence before individual skill pages can be added.