I accept Deathknight as LA+5 , you will need to convert that damage reduction 15/+1 to I believe it is
DR 10/magic
notation the Undead Followers: portion you would not benefit from as it is a leadership effect - which I have banned.
the Summon Mount (Su): will follow the same rules as the paladins special mount rule - except you are evil ( No nightmares as mounts sorry)