I see this build has been done to death, I want to add my version. Everybody says that cleric/rogue are very powerful and I wanted to test what I could take out of them).

For added cheese I did put a single monk level in the build in order to get wisdom AC bonus (It has been so hard to avoid the temptation of a dual kama wielder...).

This is a fairly explosive build, he is not really good when he is unbuffed but he can become awesome once he self buffs himself he can reach
49 AC with plain clothes (self buffed and dualwielding)
58 AB with mundane dual daggers and 1d4 +28 +1d6 +[12d6] damage per hit with 3(4 if hasted) attacks per round at full BAB.

He also has epic dodge and can cast improved invisibility (50% concealment) and can reach really good AC.

He can cast anything from scrolls (I recommend finding premonition, summon spells, keen edge, flame weapon, mage armor, cat's grace as a basic set).

He can summon, use darkness, hammer of the gods... to land his 12d6 sneak attacks (with crippling strike) on his victim.

Some of his buffs wont last long, but with the right planning he can take down almost anything in matter of seconds.

Tactics:

This one is the most effective against non-true vision enemies:
Use your long term buffs on you, set up a "battlefield" with area spells (Darkness + blade barriers + creeping doom), cast your short term buffs and lure your victims to the darkness.

Use a summon. Uses to work good... but for very short time.
Find a tank and get him in the frontline while you safely backstab things to death.


Cons:
If you get dispelled you are dead.
I dont recommend playing this one on a world with high rest restrictions nor lots of creatures with true vision.


Cleric(16), Rogue(23), Monk(1), Halfling

STR: 12
DEX: 18 (30)
CON: 12
WIS: 15 (18)
INT: 10
CHA: 8

Concentration 42(43)
Disable Trap 4(4) [+8 from clerical domains]
Hide 43(53) [+8 from clerical domains]
Move Silently 43(55) [+8 from clerical domains]
Open Lock 1(11) [+8 from clerical domains]
Spellcraft 40(40)
Tumble 40(50)
UMD 31(30)

The character build calculator didn't work properly, so I will show my calculations:

AC: 10(Base) + 1(Halfling) +10(Dex) +4(Wisdom) +8(Tumble) = 33 Naked AC
AB: 25(Base) + 10(Dex) + 1(WF) + 2(EWF) +1(Epic Prowess) +1(Halfling) = 40AB -2(Dualwielding) = 38AB

Self Buffed AC:
33 (Base)
+5 Magic vestments
+5 BarkSkin
+1 Owl's Wisdom
+5 Shield of Faith
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
49 AC

Note: You still can buff (from other sources) your dex by 12 and your wisdom by 10, that would net you 11 more AC netting 60 AC

Self Buffed AB:
38 (Base)
+5 Greater Magic Weapon
+5 Divine Favor
+5 Divine Power
+2 BattleTide
+1 Prayer
+1 Bless
+1 Aid
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
58 AB

Note: You still can buff your dex (from other sources) by 12 for 64 AB

The attack sequence (if hasted) would be:

+58/+53/+48/+58(Divine Power)/+58(Haste) Main Hand
+58/+53 Off Hand
(I am not sure if the dualwield penalties apply to extra attacks)

Giving yourself 4 Attacks/round at full AB

Damage per hit with mundane daggers (Unbuffed):
1d4(Dagger) + 1(Str) +[12d6 Sneak Attack]

Damage per hit with mundane daggers (Buffed):
1d4(Dagger) + 4(Str to 18 with divine power) +1(from bull's str) +10(darkfire) +1d6(darkfire) +5(Greater magic weapon) +1(Prayer) +2(BattleTide) +5(Divine Favor) +[12d6 Sneak attack] =

It results in a decent 1d4 +28 +1d6 +[12d6]


Halfling: (Fearless, Good Aim, Lucky, Skill Affinity: Listen, Skill Affinity: Move Silently, Small Stature)
01: Rogue(1): Ambidexterity
02: Rogue(2): Ro: (Evasion)
03: Cleric(1): Weapon Finesse, Domain Trickery, Domain Plant
04: Cleric(2): DEX+1, (DEX=19)
05: Cleric(3)
06: Cleric(4): Weapon Focus: Dagger
07: Rogue(3): Ro: (Uncanny Dodge I)
08: Cleric(5): DEX+1, (DEX=20)
09: Cleric(6): Two-Weapon Fighting
10: Cleric(7)
11: Cleric(8)
12: Rogue(4): WIS+1, Improved Two-Weapon Fighting, (WIS=16)
13: Cleric(9)
14: Cleric(10)
15: Cleric(11): Extend Spell
16: Cleric(12): WIS+1, (WIS=17)
17: Rogue(5)
18: Rogue(6): Toughness
19: Rogue(7)
20: Rogue(8): DEX+1, (DEX=21)
21: Monk(1): Epic Weapon Focus: Dagger, M: (Cleave, Improved Unarmed Strike, Stunning Fist)
22: Rogue(9)
23: Cleric(13)
24: Cleric(14): DEX+1, Epic Prowess, (DEX=22)
25: Cleric(15)
26: Rogue(10): Improved Evasion
27: Rogue(11): Great Dexterity I, (DEX=23)
28: Rogue(12): DEX+1, (DEX=24)
29: Rogue(13): Defensive Roll
30: Rogue(14): Great Dexterity II, (DEX=25)
31: Rogue(15)
32: Rogue(16): DEX+1, Epic Dodge, (DEX=26)
33: Rogue(17): Great Wisdom I, (WIS=18)
34: Rogue(18)
35: Rogue(19): Crippling Strike
36: Rogue(20): DEX+1, Great Dexterity III, (DEX=28)
37: Rogue(21)
38: Rogue(22)
39: Cleric(16): Great Dexterity IV, (DEX=29)
40: Rogue(23): DEX+1, (DEX=30)

01: Disable Trap(1), Hide(4), Move Silently(4), Open Lock(1)
02: Tumble(5)
03: Concentration(6)
04: Concentration(1)
05: Concentration(1)
06: Concentration(1)
07: Hide(5), Move Silently(5), Tumble(5), UMD(6)
12: Hide(5), Move Silently(5), Tumble(5), UMD(5)
17: Hide(5), Move Silently(5), Tumble(5), UMD(5)
18: Hide(1), Move Silently(1)
19: Hide(1), Move Silently(1)
20: Hide(1), Move Silently(1)
21: Hide(1), Move Silently(1)
22: Tumble(5)
23: Concentration(17), Spellcraft(11)
24: Concentration(1), Spellcraft(1)
25: Concentration(1), Spellcraft(1)
26: Hide(4), Move Silently(4)
27: Hide(1), Move Silently(2), Tumble(5)
28: Hide(2), Move Silently(1), UMD(5)
29: Hide(1), Move Silently(1), UMD(5)
30: Hide(1), Move Silently(1), UMD(5)
31: Hide(1), Move Silently(1)
32: Hide(1), Move Silently(1), Tumble(5)
33: Hide(1), Move Silently(1)
34: Hide(1), Move Silently(1)
35: Hide(1), Move Silently(1)
36: Hide(1), Move Silently(1)
37: Hide(1), Move Silently(1), Tumble(5)
38: Hide(1), Move Silently(1)
39: Concentration(14), Spellcraft(27)
40: Disable Trap(3), Hide(3), Move Silently(3)

Any ideas?
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HEAD KNIGHT: Shh shh. We are now the Knights Who Say Ekke ekke ekke ptang zoo boing!
RANDOM: Ni! On the fly, I'd say drop starting STR to 10, raise WIS to 16 (for a final stat of 19)take only 19 lvl Rogue and 20 Cleric. You lose 2d6 sneaks and some skill points (but you're gonna have a lot anyhow) but get higher boni from the domain powers, longer lasting buffs, 9th lvl spells.
If you feel you can do without crippling strike take only 16 lvls Rogue and push Cleric to 23. You lose 1 Rogue bonus feat but get 1 cleric bonus feat..I'd suggest Great Wisdom to end with 20 WIS (another +1 to AC among the rest)

Cheers
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Dilegua notte
Tramontate stelle
Tramontate stelle
All'alba vinceṛ
Vinceṛ
Vinceṛ Could drop str to 10, raise int to 12, and pump more skills if you don't want to drop rogue and increase cleric levels.
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Experience is the mother of good judgement; bad judgement is the father of experience.