The important thing here is for you to have at least 3 50CC25 mages, 2 50CC25 archers, at least 2 50CC25 healers, and one good 50CC25 duelist/tanker.
Here's how I did it:
- Katie to N
- Bashira to BB
- Phyllis to U
- Use Katie's skill then place Prince (Savior title) to O
- Use Phyllis' skill and then wait till 30/31UP. Place Pallis/Valerie/any other mage you have at W
- Use Katie's skill and place your other mage at CC
- Place your last mage at AA
- Wait for Phyllis to use her skill and then withdraw her. If your Bashira and mages at AA and CC, you shoudn't have to worry about any mobs going past the right exit.
- Place your second archer at X
- When those gold flies or whatever they are come, use Bashira's skill on the ones coming from the right.
- Activate both mage and archer's skills at W and X
- Also activate the mage's skill at CC when the boss on the far right circle leaves their range so they can target the zombies in the central circle
- When both mage and archer's skills cooldown time is done, activate their skills again once the zombies from the central circle start leaving. Activate Bashira's skill too.
- When the zombies are cleared, withdraw both mages at CC and W. You need to be fast for this step if the vampire lord is closing in on where Prince is.
- Place your duelist or tanker at P and your second healer at Z. Your duelist/tanker needs to be over 1500 hp to withstand the vampire lord's attack I believe. He attacks slow, so it gives your healers time to heal your duelist/tanker.
- Activate your healers' skills whenever you can.
- If you use a good duelist, the fight should be shorter compared to using a tanker. A tanker will take a long time to kill the vampire lord.