I want to let you know this is not play tested, but I really want it to be.
The idea behind Onion Knighting is essentially starting the game in "Hard Mode" but as levels progress they gain more points than usual.
As such I named it after the class that's often most difficult to raise but ends with great stats.
Alright let's do this
When a player "Onion Knights" his character he chooses 15 instead of 25 points to allocate between his five stats.
Upon leveling up he has 3 bonus points to apply to his stats just like normal leveling.
Every fifth level they gain a bonus of +3 to all stats in lieu of +2
At level 60 they gain an additional bonus point for leveling up, just like normal.
At level 75 they gain yet another additional bonus point for leveling up.
Too broken? Too hard? Let me know!