OK so unfortunately whilst ML have a few cool abilities your better off just going normal cleric as a large chunk of their abilities focus on Bow use and Arcane spell casting because some dev though Elf?!? when he was told to make an Iconic cleric instead of something like Aasimar which would have made way more sense (and would follow the them of iconics being unique versions of existing races instead just another elf...which we now have FOUR of)
Personally I would have rather seen the existing races get "sub-races" (Elf gets Sun Elf, Drow and Half-Elf, Human gets Shadar-Kai, Aasimar and Tiefling, Dwarfs get Duergar, Warforged get Scout and Bladeforged etc.) that you would choose at creation giving a different racial tree than add PDK as a new Melee class and Morninglord should have been a Cleric Tree.
Anyways unfortunately Lama went down before I was able to copy down the morninglord abilities and Deadlock is still in the process of updating his PDF of the E-Pass so I'm going off of memory here so I'm more hoping for a discussion on possibilities here as opposed to a specific build but I will post my various ideas to get it started.
Now currently I'm in the stage of deciding on a level split and possibly a 2nd splash.
So Far I'd prefer to have have 18Wizard but 12-17 is an option if it's worth it (just use Wraith from) with Morninglord anywhere from Lvl 1-6 (5 for tier 5 enhancements if theirs any worth it and 6 for second tier core) as well as any 3rd class...not sure if there's any worthwhile enhancements in the lines but I do remember you could enhance Negative spellpower alot...anyone know if that stacks with the Palemaster Neg Spell power?
The main reason for a 1 splash of Morninglord is access to the Heal skill for more Neg spellpower...the few powers that are not elf related are nice but I'm pretty sure they require wisdom so this build would likely crank as much AP into PM as possible just for the spellpower despite alot of the PM abilities being abysmal (ie. Cloak of Night and the Undead Raise) than anything leftover into Archmage.
As for splashes I'd say Fighter1 or Monk1 are best simply for the extra feat (assuming an 18/1/1 build) but a Monk2 or Rogue 2 + Insightful reflexes would be good too (assuming 12-17 Wizard)
One thing I'd like to fit in now that sneaking has had an update and since wraith has a nice +20 MS (and invisibility negates the need for hide) is of course Move silently but that shouldn't be too hard especially with a splash of monk or rogue 1.
Personally I'm trying to roll up a Wiz17/Rogue or Monk2/ML1 and a Wiz18/ML1/Rogue or Monk1 as I'd prefer it to just be a normal wizard with a twist. So far I'm more likely to go rogue as Wizards really don't need extra feats.