HEHE Sorry Maybe because its for pros or math freaks XD
So I will try to explain it.
You dont start the game with lvl 100 rb but with lvl 1 and with this formula you can calculate about what you shall have step by step.
e.g. Step 1, we take lvl 100, this means you have about 300 points. and 5 / 10 is 1 / 2 and that's the half. So about 150 points at lvl 100
Then next step e.g. lvl 180, that's mean you have 540 points so then you shall have at Agi about 270 points.

Knight Increases Spd and if I would make one then the fastest Knight that exists XD

if u still dont understand then sorry XD i gived my best ^_^