Hmm... So, how many monodrones (the lowliest natives of Nirvana) would it take to equal the might of a single red slaad (the lowliest natives of Limbo)? Doesn't seem like a fair fight to me...
And if one can summon slaadi using the cacodemon spell, etc., then why can't one summon modrons? (Wait - maybe it's because modrons don't have names? Or do they?
)