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 Might: Activate this ability to add +2 to damage per tier for one minute.
 * Divine Vitality: Activate this ability to restore a small amount of spellcasting energy to another character.

Paladin Enhancements
The Turn Undead feat can be used as charges for the following paladin enhancements:
 * Divine Light: Activate this ability to deal light damage to the targeted undead creature instead of attempting to turn it.
 * Divine Might: Activate this ability to add +2 to damage per tier for one minute.
 * Divine Righteousness: Activate this ability to gain +100% threat generation for one minute.

Faith Enhancements
The Turn Undead feat can be used as charges to grant proficiency with certain weapons with the following faith based enhancements:
 * Lord of Blades (Warforged only): Greatsword
 * Silver Flame: Longbow
 * Sovereign Host: Longsword
 * Undying Court (Elf and Half-Elf only): Scimitar
 * Vulkoor (Drow only): Shortsword

These buffs are unusual in that they will last until logout, and remain even through rests and death.

Prestige Enhancements
The Turn Undead feat is used as charges for certain prestige enhancement abilities:
 * Radiant Servant (Cleric)
 * Positive Energy Burst: Activate this ability to release a restoring and healing burst centered on the cleric. Affects nearby allies and enemy undead.  Works within anti-magic cones.
 * Positive Energy Aura: Activate this ability to gain a healing aura that will heal over time. Affects nearby allies and enemy undead.
 * Defender of Siberys (Paladin)
 * Magic Circle: Identical to Magic Circle Against Evil
 * Mass Shield of Faith: Identical to Shield of Faith, Mass
 * Glorious Stand: Activate this ability to gain a DR 20/Epic, reduced damage from elemental and negative energy, double healing from positive energy, and immunity to secondary effects of attacks such as 'wounding' or 'vorpal'. Lasts 30 seconds.
 * Knight of The Chalice (Paladin)
 * Censure Demons: Activate this ability to attempt to stun a targeted Chaotic Evil Outsider.