This is a dexterity based build that requires weapon finesse. I swapped the finesse feat out for precision because the Epic Midnight Greetings grants it as a feat. The only reason for having points in strength is to keep from being overloaded. The high dex provides both AC and saves.
I really don't like having to change gear to to use skills. With the gear I have I don't have to. I think this build will pass all skill checks for skills that have points in them with the gear that is equipped. The weakest skill being spot may require GH in some epic elite quest but because traps are usually in the same place you kind of just learn where to search.
Being true neutral means receiving less aligned damage. UMD skill will be enough to equip items that require other alignments.
The EMG uses dexterity as a modifier for attack and damage. Base damage is normally in the 45 - 65 range with crits in the low to mid hundreds. Its more on helpless mobs. Sneak attack damage is in the low to mid hundereds. Its quite normal to do 200 points of damage per swing not counting crits or disintergration. This works against almost everything but does require the good DR upgrade. Even when it does not break DR it will beat the damage of a weapon that breaks DR but does not use dex for a modifier.
Assassinate is a solid 48 fort save. It's a challenge to use assassinate effectively. Enter each room first in stealth allowing a clear path from the mobs to your party members who are following you. Try to guess where they will meet and move just past that. The mobs will approach and then stop to attack your party members. That's when you strike. This is effective for two reasons. If you don't wait the mobs can run to your party and you can miss the attack altogether. It also helps to let someone else establish aggro so you can break off of your attack. You cant hide while you have aggro. You have to stop swinging, enter hide mode and strike. Not everyone can enjoy it. It has a 15 second cool down so you swing for 12 more seconds and do it again.
If I were to change something on the build I might shift some points from dex to int. It would help with the assassinate but lower the base damage. The base damage is somewhat important when fighting a boss or something that can not be assassinated. Its good to be at least moderately effective against undead, elementals and constructs. Because they don't take any back stab damage it is important to have some base damage that still works.
Its not a 'Maximum Assassin' build that's built for just a few quest and not much good in the rest. It has a good spread of usefulness that works in almost any group. I would say the weakest spot would be in quest with everything undead but even then you can carry your weight.
The character planner dump below is mostly accurate through level 20. I think the thing that is missing most is that it does not show the benefit of gear.
Code:Character Plan by DDO Character Planner Version 03.14.02 DDO Character Planner Home Page Ender Neutone Level 20 True Neutral Halfling Male (20 Rogue) Hit Points: 274 Spell Points: 0 BAB: 15\15\20\25\25 Fortitude: 15 Reflex: 26 Will: 7 Starting Feat/Enhancement Abilities Base Stats Modified Stats (34 Point) (Level 1) (Level 20) Strength 10 12 Dexterity 18 31 Constitution 16 18 Intelligence 16 21 Wisdom 8 10 Charisma 8 10 Tomes Used +1 Tome of Strength used at level 1 +1 Tome of Dexterity used at level 1 +1 Tome of Constitution used at level 1 +1 Tome of Intelligence used at level 1 +1 Tome of Wisdom used at level 1 +1 Tome of Charisma used at level 1 +2 Tome of Strength used at level 7 +2 Tome of Dexterity used at level 7 +2 Tome of Constitution used at level 7 +2 Tome of Intelligence used at level 7 +2 Tome of Wisdom used at level 7 +2 Tome of Charisma used at level 7 +3 Tome of Dexterity used at level 11 +3 Tome of Intelligence used at level 11 Starting Feat/Enhancement Base Skills Modified Skills Skills (Level 1) (Level 20) Balance 8 35 Bluff 3 34 Concentration 3 6 Diplomacy -1 2 Disable Device 7 30 Haggle -1 2 Heal -1 2 Hide 8 47 Intimidate -1 2 Jump 4 28 Listen -1 4 Move Silently 8 45 Open Lock 8 35 Perform n/a n/a Repair 3 7 Search 7 30 Spot 3 25 Swim 0 19 Tumble 8 32 Use Magic Device 3 25 Notable Equipment Epic Helm of the Red Dragon Tharne's Goggles Planer Focus Epic Utility Vest Epic Bracers of Deftness Whisper Ring Boots of the Woodsman Supreme Tyrant Green Steel Weave Gloves of Mineral Awanahu Sash Epic Cloak of Night Epic Necklace of Venom Epic Midnight Greetings Epic Midnight Greetings Level 1 (Rogue) Feat: (Past Life) Past Life: Rogue Feat: (Selected) Toughness Level 2 (Rogue) Level 3 (Rogue) Feat: (Selected) Precision Level 4 (Rogue) Ability Raise: DEX Level 5 (Rogue) Level 6 (Rogue) Feat: (Selected) Two Weapon Fighting Level 7 (Rogue) Level 8 (Rogue) Ability Raise: DEX Level 9 (Rogue) Feat: (Selected) Improved Two Weapon Fighting Level 10 (Rogue) Feat: (Rogue Bonus) Improved Evasion Level 11 (Rogue) Level 12 (Rogue) Ability Raise: DEX Feat: (Selected) Improved Critical: Slashing Weapons Level 13 (Rogue) Feat: (Rogue Bonus) Opportunist Level 14 (Rogue) Level 15 (Rogue) Feat: (Selected) Greater Two Weapon Fighting Level 16 (Rogue) Ability Raise: DEX Feat: (Rogue Bonus) Skill Mastery Level 17 (Rogue) Level 18 (Rogue) Feat: (Selected) Toughness Level 19 (Rogue) Feat: (Rogue Bonus) Skill Mastery Level 20 (Rogue) Ability Raise: DEX Enhancement: Rogue Damage Boost I Enhancement: Rogue Damage Boost II Enhancement: Rogue Deadly Shadow Enhancement: Halfling Dexterity I Enhancement: Halfling Dexterity II Enhancement: Halfling Cunning I Enhancement: Halfling Cunning II Enhancement: Halfling Cunning III Enhancement: Halfling Guile I Enhancement: Halfling Guile II Enhancement: Halfling Guile III Enhancement: Rogue Subtle Backstabbing I Enhancement: Rogue Subtle Backstabbing II Enhancement: Racial Toughness I Enhancement: Rogue Faster Sneaking I Enhancement: Rogue Faster Sneaking II Enhancement: Rogue Faster Sneaking III Enhancement: Rogue Assassin I Enhancement: Rogue Assassin II Enhancement: Rogue Assassin III Enhancement: Rogue Sneak Attack Accuracy I Enhancement: Rogue Sneak Attack Accuracy II Enhancement: Rogue Sneak Attack Accuracy III Enhancement: Rogue Sneak Attack Accuracy IV Enhancement: Rogue Sneak Attack Training I Enhancement: Rogue Sneak Attack Training II Enhancement: Rogue Sneak Attack Training III Enhancement: Rogue Sneak Attack Training IV Enhancement: Improved Hide I Enhancement: Improved Hide II Enhancement: Improved Move Silently I Enhancement: Improved Move Silently II Enhancement: Rogue Dexterity I Enhancement: Rogue Dexterity II Enhancement: Rogue Dexterity III Enhancement: Rogue Wand and Scroll Mastery I Enhancement: Rogue Wand and Scroll Mastery II