I am making a video game and I need to explain to the user how a skill tree works.
Basically, when you increase the level of the "up" skill, the skill "below" becomes unlocked, however "up" and "below" is not correct since it can be on the right side like this:
So, when the user presses the locked skill, I need to use a little phrase that explains it.
I was thinking something like this "Unlock the previous skill united by the line."
However, that sounds very bad to me.
How do you refer to [something] that is united/joined to [another thing] by [something]?