Banish Undead

In Release 18 had changed reagents, increased damage and if undead is killed by this spell it should prevent it form resurrecting it.

''Banish Undead: If the killing blow to an undead is from the “Banish Undead” spell then they will not resurrect. Banish Undead also does far more damage to undead creatures now.''

External Reference

 * Magic, Combat, and Crafting Skills on the Shroud of the Avatar Forums