Smiting 12
Healing 12
Strength 5 (rune and armor)
Mending
Balthazaar's Spirit
Balthazaar's Aura
Symbol of Wrath
Sprint
Smite Hex
Healing Breeze
Shield of Judgement (E)
-2 Shield and smiting rod, OR Ivor's Staff (20/20 smiting)
Just remember that Smiting weapons do double damage against undead, so leave your melee stuff at home.

The Mesmers should always be your first targets. Get in close and use Smite Hex which has a good radius and does 140 damage to all nearby fools. Hit Shield of Judgement when you have enough fools attacking at once. Heal as necessary (the +8 Breeze helps with the poison, bleeding, and degen hexes you'll encounter). Follow the course of the mission until you get to the bridge over the poison swamp, then hook a left and go down to the Undead Jackpot. Symbol of Wrath and BZ's Aura will light up the Hellhounds and Ghouls at the end that pop up out the ground.
Once you've nuked all the undead, just re-renter the mission. I also pick up the bones and glittering dust, since they stack.
Each run takes a little over 10 minutes, and I get about 20 emblems per run. That way you can load up on your holiday items. Enjoy!