Clerics can turn the undead and drive them away by means of faith alone, brandishing their holy symbol and calling upon the power of their divine patron. This is a special ability unique only to clerics.
When the party encounters undead, each cleric within the party can try and turn them (or, if of sufficient level, outright destroy them). Undead are turned/destroyed according to the chart below (where a value indicates the result of a 1d20 needed to turn, a "T" indicates an automatic turning and a "D" indicates outright destruction). A "--" indicates that the type of undead cannot be affected by the cleric.