Inheritance (White) Skills
White skills are the standard skills. They are cheaper to learn but have less impact than Gold skills. However, they are crucial for triggering mid-race combos or satisfying activation conditions for Unique skills.
Hint Levels
Inheritance events and support card training can give you "Hint Levels". Each level reduces the skill point cost by ~10% (up to Lv 5 for -40% cost).
(Database of White Skills Coming Soon)