Skills (スキル) are a collective name for abilities used by individuals in Infinite Dendrogram.
Humans are only capable of using skills via equipment or jobs and in the case of Masters, via their Embryos. Monsters on the other hand are capable of using skills naturally. They typically require MP or SP as a cost to be used. Skills can be classified in various ways based on the conditions for use and their functions.
A passive skill is a skill that can be activated continuously or can be automatically activated when the trigger conditions are met. Passive skills generally do not consume MP or SP as a cost. Passive skills can be deactivated, though there are rare cases where they cannot be, such as the Journalist skill The Pen is Mightier than the Sword.
An active skill is a skill that can be activated by the users' will.
An equipment skill is a skill that is granted to a piece of equipment. They are granted by production type job skills. The more powerful the effect or greater the number of skills granted to a piece of equipment, the higher the chance of failure.
Skills that can be acquired by receiving a job. They can be divided into General Skills (通常スキル), skills that can be used regardless of the job set as main job, Characteristic Skills (固有スキル), which can only be used when the job set as the main job is within the same grouping, and Ultimate Skills (奥義), the strongest skill a job has. In the case of Superior Jobs, the ultimate skill can only be used when the Superior Job is set as the main job. When a job is reset, all skills gained via that job are reset as well.
Beside those three, there is also the Final Blow (最終奥義). The Final blow is a skill that goes beyond the Ultimate Skill that exists only in Special Superior Jobs and certain Superior Jobs. The trigger conditions and acquisition conditions are very strict, and the costs associated with activation are enormous, and above all, using the skill itself is almost synonymous with death of the user, which is the literal “final” trump card.
Original skills are new skills not found in jobs or equipment that can be created by an individual. Normally, creating skills is the province of those with Superior Jobs from The One series, but for caster type jobs, it is possible for talented high rank job users to create original spells. Original skills can normally only be used by the creator, but a degraded version can be taught to a direct disciple. In rare cases, an original skill can be overwritten into a job by the Archetype System, only subsequent job holders to use the skill.
Embryo Ultimate Skills
Each Embryo has an Ultimate Skill (必殺スキル) that can be called as the Embryo's greatest and strongest skills which are always named after the Embryo itself. Without any exceptions, they all possess powerful effects that strongly expresses the Embryo’s dominant characteristic. It usually appears after the Embryo evolved in its high-rank form. However, there are some cases where it appears after evolving into its 1st form or right after it evolved into a Superior Embryo. There are also some rare cases where it has yet to appear even after evolving into a Superior Embryo.
Embryo Ultimate Skills often possess either a long cooldown, heavy cost, or other prerequisites and restrictions. As such, they are normally not used casually, and treated as trump cards. Even if it is acquired at an early stage, the output may increase due to evolution, and variations may appear.
Skill Levels refers to the level that a skill possesses. This can affect the power of the skill as well as whether or not it can be resisted by the opponent's skills. Low rank jobs have a skill level cap of 5, and high rank jobs have a skill level cap of 10. Once the level cap of 10 is achieved, no matter what type of equipment is used to raise the skill level, it cannot increase any further. Certain Superior Jobs have jobs skills at the EX level.
A category of skill that can be achieved when using certain jobs. Sense skills can assist people by correcting their movements, and the higher the skill level, the faster and more accurate the correction. This skill can be used so that even complete amateurs can perform activities such as piloting vehicles, cooking, engineering, etc. However, if they attempt motions that are illogical, the skill's effect will worsen. Unlike other skills, the effectiveness of sense skills can depend on the native talent and ability of the user. If the user possesses no talent, then the effect of the sense skill will be weak. Conversely, if the user has native talent, the effect of the sense skill will increase.