Originally Posted by
Andezzar
A293
It is pretty much "ask your DM".
1st Progression: If you can meet the prerequisites for Master Thrower with that progression it should be OK
2nd Progression: Is not OK for three reasons. One you cannot qualify for Bladesinger with the classes you have, two Bladesinger may not even be allowed(Fighter/Mage hybrid) and three you may not have two PRCs on the same level
3rd Progression: Has problems one and two of the 2nd progression. So it is up to the DM, if the Bladesinger PRC is allowed.
If the prerequisites were met, you could have more than one PRC on the character, but not two on the same level, just as you quoted.