thanks for comments guys, i went and tried it and it was was fail.
* army drum does not give morale any dragons.
* persuasion 2 did not give me extra morale for humans.
* black knight morale does not give morale to itself but any other undead in army.
so basically i ended up with only morale +2 on all army. UNLESS i am doing some thing wrong
so question is there any way to give +3 morale to dragons. except bone which gets 2 from mind tree then +1 from black night.
by the way dragons rock with even +2 morale. they take out so much before i have to pull them back. by that time paladins and black knights, both stone skined reach front line to finish off every thing , even with +2 morale its become like easy mode.