Not Supported.
Part of the appeal at least for me in training a paladin is that I can chose to either be a mana ##### and h2k things OR beat the crap outta stuff. I dont know how much easier it would make a paladin to train with du, considering that a paladin can already go to undead mobs with a cleric and get CE'd and beat the crap outta the mobs or heal them. If my paladin goes to say rax with even our lvl 27 cleric and gets CE, hance, and with Champs cast I can do more damage then a cleric does to the mobs healing them.
The only benefit I would see for having this spell would be to make it so that paladins would then do more damage with the spell then they could by hitting the monsters, thus making them even more powerful then clerics against the undead. Which would make them even easier to train then a cleric...but only if they use healing spells. Seems like it would make them even more unbalanced that way, and make them less of a holy warrior. Ugh and then paladins and clerics would compete for places to train.
Piddy's input;
Shera with CE and hance (from an arch cleric) with champs cast can do 151 damage per stam to undead with soe(that would be near 300 damage with a sword of light)..I think that's enough damage.
Imo heal training is just something that you do to get to lvl 25. A level 23 paladin with justice blade can hit over 100 damage spelled the same way.. Find a friend who likes to cleric (you all have one).
If a paladin was to heal for 100 then he would ignore clerics and heal with a paladin that gets stam faster without having to holy might, and would break it because a 29 dex paladin is untouchable by mobs.
I really tried to follow this argument but I failed.
I don't get why you even brought a cleric into the mix. We are not trying to balance around what it does with cleric spells. We are trying to balance paladins as they are by themselves.
Now if you gain more exp per hit on a paladin attacking than you would healing undead for 110 damage. Then why are you against it? It would obviously still not compete with /a ing so whats the use of it? Also, DU is only castable on Undead.. It's not a healing spell don't get confused..
Basically, DU gives paladins a consistent reliable way of training without buffing there damage/healing/supporting potential, while also making it mana dependant and therefore a trade off between which style to use to train.