This battle give you a Elite King Stone (EKS), and probably your first.
There are some over powered enemy in this level , such as a death knight with 700+ attack (and a magic damage AoE skill), and 2 grave priest with 500+ att.the best option is to take out the death knight as soon as possible to prevent he to use the AoE.
Two tatics may work:
Use Wizard with dancers to do magic damage to death knight and a guard to protect the wizard, so you can get counter kills as well.
Use halbardier to stun the death knight so you can finish it in 2 turns , and a paladin to body block auto heal the 2 grave prist.Use dancers to apply more damage on death knight