Penalties for the difference between the levels of the character and mobs (including bosses) work like this:
Level | Getting EXP/SP | Item drop | Assignment (spoil selection) |
-10 and below | 90% | 90% | 90% |
-9 | 40% | 40% | 40% |
-8 | 30% | 30% | 30% |
-7 | 20% | 20% | 20% |
-6 | 10% | 10% | 10% |
0 | 0% | 0% | 0% |
6 | 10% | 10% | 10% |
7 | 20% | 20% | 20% |
8 | 30% | 30% | 30% |
9 | 40% | 40% | 40% |
10 and up | 90% | 90% | 90% |