Turn Undead

The Ability to send Undead away from you and your party. If the undead being Turned is significantly less powerful than the cleric, then it is destroyed rather than turned.

Turn undead mechanics
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1. Turning check: A charisma check (1d20 + your charisma modifier) determines the hit dice of the most powerful enemy you can affect (see table below).

2. Turning damage: Total number of hit dice you can affect is 2d6 + effective cleric level + charisma modifier Paladins get a -3 to level

Destroying undead: If you have twice as many effective cleric levels (or more) as the undead have hit dice, you destroy any that you would normally turn

There are also items, spells and enhancements which can help increase your turning ability by boosting your effective cleric level for turning. These bonuses are added all parts of the turn undead calculation: These 4 item enhancements do not stack
 * a Sacred item, adds +2 enhancement bonus to your cleric level.
 * a Hallowed item, adds +2 to the total hitdice turned.
 * helm: Seraphim
 * a Eternal Faith item, adds +2 enhancement bonus to your cleric level, maximum hit dice +2, and total hitdice by +4.
 * trinket: Token of the Faithful
 * a Silver Flame item, adds +6 to the total hitdice turned.
 * shield: Aegis of Flame
 * The spell Seek Eternal Rest will add a stackable +4 sacred bonus to your cleric level.
 * The cleric/paladin enhancement line of Improved Turning can add from 1 to 3 points to your cleric level.
 * The feat Improved Turning will add 1 to your cleric level.
 * Armor of Command adds a bonus to Charisma based checks, which might include Turning attempts.

Cleric Enhancements
The Turn Undead feat can be used as charges for the following cleric enhancements:
 * Divine Cleansing: Activate this ability to grant another character a morale bonus on Fortitude saves for a short time.
 * Divine Healing: Activate this ability to give another character healing that persists over several seconds.
 * Divine Light: Activate this ability to deal light damage to the targeted undead creature instead of attempting to turn it.
 * Divine Vitality: Activate this ability to restore a small amount of spellcasting energy to another character.
 * Divine Might: Activate this ability to add +2 to damage for one minute.

Paladin Enhancements
The Turn Undead can be used as charges for the following paladin enhancements:
 * Divine Might: Activate this ability to add +2 to damage for one minute.