RonelGG の投稿を引用：

I am asking this because I just found out that Soldier class has an extra skill tree. Maybe the creator added a few extra acquirable skill points to add to those.

There's also a work-in-progress 4th Tree for Vampire and War_Bot that will be available in the future.

The 4th Tree is mostly intended as a tree that carries Ultimates or a one-point game changing passive.

The usual rules of 132 points gained from level-ups and fame can easily accommodate the 4th Tree.

I can recommend the Skill Points x2 mod in the load order if still in need of further points.

The Soldier only allows one skill point total to be invested within any the 8 active skills seen in it's 4th tree (usually a skill offers 15 points of investment). The player can invest into all 8 skills at the same time however the balance is that the Charge Bar has to be filled to use any of them once before a Cool-Down activates for 12 seconds before any 4th tree skills can be activated again (as it prevents the Charge Bar from filling within that time).