Rewards

In the end, Abel took away 8 potion formulas from these racks. They were the 'qi increasing potion', 'body strengthening potion', 'bruise clearing potion', 'poison clearing potion', 'bone cleaning potion', 'windproof potion', 'hundred turn potion', and 'solidify blue potion'. 

'Qi increasing potion' was more direct than doing combat qi training for a human knight. They just needed to drink some before each knight breathing session, and they would be able to get an increase in combat qi.

'Body strengthening potion' could strengthen the body of the user. If a knight drank some alongside the 'qi increasing potion,' they would be able to have a stronger body to sustain their combat qi capacity.

'Bruise clearing potion' was self-explanatory. It would be useful during knight training. 

Also, all potions other than the master's one had side effects. Therefore the best way to deal with those side effects and everyday injuries was with another potion.