(partially) responding to SorO
Level 30 is kinda incompatible with a
reasonable game. So it shouldn't be
a surprise that: bad, average, good,
really good, ridiculously good, and
"B"eyond that, are mentioned.
Perhaps a better set of responses could
be had by asking the OP, what he thinks
he wants to
do with said Max level 30
Leadership score. And then we'll chime
in with what (kinda) works.
So OP ... what do you think you want to do with it all
EDIT --- oh yeah Thrallherd <<< Magic+ Leadership.
Thrallherd has to dip into non-psi to get going like that.