Here is another one for today.
What this build gives you: 17 pre-epic BAB for 6 unarmed attacks per round (7 with flurry of blows); your unarmed attacks apply 2 negative levels each giving you temp HP each time; enemies you kill with your fists are transformed into level-scaled wights you control; wights explode like a bomb on death damaging everyone around (destruction retribution); can shapeshift into any creature you kill with your unarmed attacks for 24 hours (you can even use their special abilities) giving you a boost to physical abilities and AC; wisdom to AC; flurry of blows; hide in plain sight; 17d6 death attack; true death attack; additional bonuses to strength, dexterity, constitution, saves and skill checks for 24 hours after draining levels.
Weak points: critical-immune and sneak attack-immune enemies must just be beat down, no sneak attack damage boost. High DR and enemies with immunity to level drain may give you trouble - I suggest always having a good enchanted kama handy you can quickly switch to and deal with those enemies. Not many options for healing - it is a good idea to get regeneration equipment on this build. The saves and AC are good in this build, but not as crazy high as I like them to be.
Build Name: Bruce Leech
Race: Githzerai
Alignment: Lawful Evil
STR 12
DEX 20
CON 10
WIS 18
INT 14
CHA 8
Lvl Class
1 Monk 1: Expertise, Lore 2, Hide 4, Move Silently 4
2 Monk 2: Hide 5, Move Silently 5
3 Monk 3: Weapon Focus (Unarmed Strike), Hide 6, Move Silently 6
4 Monk 4: 19 WIS, Hide 7, Move Silently 7
5 Monk 5: Hide 8, Move Silently 8
6 Assassin 1: Alertness
7 Assn 2
8 Soul Eater 1: 20 WIS
9 SE 2: Improved Disarm
10 SE 3
11 SE 4
12 SE 5: Corpse Crafter, 21 WIS
13 SE 6
14 SE 7
15 SE 8: Destruction Retribution
16 SE 9: 22 WIS
17 SE 10
18 Assn 3: OPEN FEAT
19 Assn 4
20 Monk 6: 23 WIS
21 Assn 5: Epic Skill Focus (Hide)
22 Assn 6
23 Assn 7
24 Assn 8: Epic Skill Focus (Move Silently), 24 WIS
25 Assn 9
26 Assn 10
27 Assn 11: Epic Fortitude
28 Assn 12: 25 WIS
29 Assn 13
30 Assn 14: Epic Will, B: Epic Reflexes
31 Assn 15
32 Assn 16: 26 WIS
33 Assn 17: Improved Sneak Attack
34 Assn 18: B: Improved Sneak Attack
35 Assn 19
36 Assn 20: Improved Sneak Attack, 27 WIS
37 Assn 21
38 Assn 22: B: Improved Sneak Attack
39 Assn 23: Improved Sneak Attack
40 Assn 24: 28 WIS
Note, this is a great candidate for an undead template like necropolitan (you will need to use Soul Radiance to get a humanoid's form to qualify) for the immunities and getting healed by the negative energy burst when your wights explode. Make sure to buy off the githzerai level adjustment as soon as you can (level 6 and 9).