ねばならない/ねばならぬ/ねば => have to do; must; should ~ N2
~きわまる/きわまりない(~極まる/極まりない)      => extremely; very ~ N1
ね => isn't it? right? eh? N5
~まじき      => should not; must not N1
~あるまじき => ~ Unacceptable, not allowed N1
Ban
いただきます => to receive N4
Benefit
かねない => Afraid that N2
Potential, Possibility
ね => Requests confirmation from the listener N5
Particles
つきましては => about; concerning; regarding N2
Cause, reason
[極「きわ」]み/[極「きわ」]まりない => Extremely A N1
Degree/ Level/Amount
かねる => unable to do something; can’t do something N2
ねばならない => Must A N2
Needs, Requirements