When I ran an evil gestalt game a while back, one player actually made an extremely fear-focused character. Build by end of the game is posted in sblocks below, there were probably some houserules affecting things, and the game was 34 point buy w/ a bonus 1st level feat, but I'm sure from the feats, spells, etc.... you can pluck useful tidbits. All I remember is if he used a melee touch spell, he could trigger up to 3 fear saves per round, and dread witch made him ignore fear immunities.
[sblock]Charir Vignar
Human Sorcerer 7/Dread Witch 3///Dragonfire Adept 10
Str8, Dex 16 [18], Con 16 [18], Int 10, Wis 10, Cha 18 [20]
47163/45000 EXP
HP: 113/113 (10d8+40+1+10)
AC: 22 [25] (10+5 natural+4 dex-1 flaw+2 shield+1 deflection+1 armor [+4 armor mage armor)
Touch: 14, Flatfooted 20 [23]
BAB +5
Fort +13, Ref +9, Will +11
(+6 vs Sleep and Paralysis, +5 vs fire, +5 vs fear)
Fire Resistance 5
DR 2/Magic
Speed: 30, Fly 30 (good)
Melee Touch +9
Feats:
Draconic Toughness (+2X HP)
Draconic Senses (+X to Spot, Listen, Search, Darkvision 60, Blindsense 20)
Draconic Presence (Whenever cast a spell, spell ALSO forces will save vs all enemies within 10 feet or shaken for 1 round/spell level. Dragons and creatures with int of 2 or less are immune)
Draconic Heritage (Red) (b) (+X vs Sleep, Fire, Paralysis)
Draconic Skin (+1 nat armor)
x=Draconic feats
Dragontouched (b) (Dragonblooded. +1 spot, listen, search, HP, vs sleep, vs paralysis)
Frightful Presence
Unnatural Will (b) (Add both Charisma and Will to saves vs fear)
Weapon Finesse
Flaw: Vulnerable
Darkvision 60, Blindsense 20
Class Features:
Breath Weapon (5d6+1d6 fire, cone 30 or line 60, at will) DC 19
Scales +3 nat armor
+4 Diplomacy vs dragonblooded creatures
immunity to frightful presence
Draconic Heritage (no familiar)
DR 2/magic
Master of Terror (+1 to save DC of fear spells and +2x Dread Witch level to intimidate)
Absorb Fear (+1 CL for each level of fear attempted against Charir, successful or not. May instead be used to cast low level spells)
Fearful Empowerment 1/day (All creatures targeted by a spell with visual effects must make a will save DC 19 or be shaken for 1d4 rounds)
Breath Effects:
Lightning Breath (60 foot line of electricity instead of fire)
Weakening Breath (-6 str for 4 rounds, fort reduces to 2 rounds, no damage)
Thunder Breath (30 foot cone of sonic, fort half)
Invocations:
Beguiling Influence (+6 Bluff, Diplomacy, Intimidate)
Breath of the Night (Fog Cloud at will)
Frightful Presence
Draconic Flight (Fly 30, good)
Spells:
0th, 6/6/day: Prestidigitation, Arcane Mark, Detect Magic, Ghost Sound, Mage Hand, Light, Message, Read Magic DC 15
1st, 8/8/day: Magic Missile, Feather Fall, Shocking Grasp, Ray of Enfeeblement DC 16, Cause Fear DC 17
2nd, 7/7/day: Incendiary Slime, Combust, DC 17, Bane, Doom, Scare, Visions of Entropy DC 18
3rd, 7/7/day: Fireball, Junglerazer, Explosive Runes DC 18
4th, 5/5/day: Bestow Curse, Voice of the Dragon DC 19
Languages: Common, Draconic
Skills:
Bluff +24 (13 ranks +5 cha+6 influence)
Concentration +22 (13 ranks +4 con+5 tunic)
Diplomacy +25 (12 ranks+5 cha+6 influence+2 synergy) (additional +4 vs dragons)
Intimidate +32 (13 ranks+5 cha+6 influence+2 synergy+6 Master of Terror)
Spellcraft +7 (7 ranks)
Knowledge (Arcana) +3 (3 ranks)
Listen, Spot, Search +6 (Draconic feats)
Skill Tricks: Never Outnumbered
Gear:
Shield: +1 Mithral Buckler
Head:
Face:
Shoulder: Cloak of Charisma +2
Throat: Amulet of Health +2
Body: Ghost Shroud with +1 Armor Bonus
Torso: Tunic of Steady Spellcasting and +2 Resistance
Hands: Arcanist's Gloves
Arms: Dragonhide Bracers
Left Ring:
Right Ring: Ring of Piercing Spells (3/day)
Waist: Dragon Spirit Cincture
Feet: Boots of Dex +2
-Earring of the Wolf
Infinite Scrollcase-> Scroll of Protection From Evil x 4, Web x3, True Strike x2, Whirling Blade, Invisibility x2, Disguise Self x2, See Invisibility x2, Remove Curse, Animate Dead, Enervation x2, Voice of the Dragon x2
Wand of Mage Armor (34 charges)
Adventuer's Kit
Spell Component Pouch
Potions of CLW x2
Vest of Resistance +1 (Unequipped)
Wand of Ray of Clumsiness (20 Charges)
EWand of Benign Transposition
EWand of Unseen Servant
Dagger
2x Masterwork Clawed Gauntlets [Spiked Gauntlets, designed to look like scales with dragon claws] (Will be ready upon return to town)
Trollgut Rope
11041.75 GP
+882
+875
Fear aura descriptions:
Draconic Presence feat: Whenever I cast an arcane spell. Will save or shaken 1 round/spell level. Only works on non-dragons, with int 3 or higher and HD fewer than my own. Doesn't work on already shaken foes. Save 10+Spell Level+Cha
Frightful Presence feat: Activation- Whenever I attack or charge. 30 foot radius. Will save or shaken for 1d6+Cha rounds. Only works on non-dragons, with int 3 or higher and HD fewer than my own. DC 10+Half Character level+Cha (20). Save applies for 24 hours
Invocation: Activation- Swift action after attacking or using breath weapon. 30 foot radius. Will save or shaken for 10 minutes. Dragons are immune. DC 13+Cha (18)
[/sblock]
EDIT: If you're doing an undead-themed bard, what about the Song of the Dead metamagic feat? +1 level to make a mind-affecting enchantment into a necromancy spell that affects undead.
