taken from :- https://www.reddit.com/r/treeofsavior/comments/4gnbol/game_breaking_bug_passives_going_over_level/
Steps to reproduce it:
Go to your Class Attribute Learner
Upgrade the skill til’ the last level(you must have 1 level left to upgrade)
Before you reach the last level click several times at the skill than
click several times over the Yes button and you should be able to
reproduce it.
There are some skills that has few levels and those ones are really game breaking if you successfully upgrade them


