Soul/SYNC

Soul/SYNC (ソウルシンク Souru shinku) is a fan-made keyword found on Grade 3 units.

How it works
Soul/SYNC is a type of skill that can only be found on Grade 3 units (usually an AUTO or CONT skill). Followed by the keyword is a field that looks like this:

This pattern represents your field, with the star in the upper middle representing the Vanguard Circle. In these circles are Numbers. These numbers show the Grade a unit in that circle must be. Once all the circles have their corresponding Grade, the skill becomes active.

Special Symbols
Sometimes, there will be special symbols in these circles.

"+/-": If the number is followed by a "+", it means it can be that Grade or higher. If it's followed by a "-", it means that Grade or lower.

[Blank]: If the circle is blank, it means there can be a unit of any Grade for it to apply. Usually the Vanguard Circle will be blank.

"X": If there is an "X", it means there CANNOT be a unit in that circle.