Slaying Arrows from Arcane Archer,
Endless Fusillade from Battle Engineer,
Sniper Shot and Aimed Shot from Deepwood Sniper,
and a handful of Sneak Attack + Improved Evasion + Int to Crossbow Damage from Rogue.
OC: Ranged is taken along with all ranged feats.
Destiny of choice is Fury with twisted Pin, Otto's and (somewhat discretionarily since you're ranged and have UMD and some scroll mastery) Cocoon.
That's the build in a nutshell.
Enhancements are what allow this build to be Shadar-kai:
11 - Mechanic - 50% Scroll Mastery / Int to Damage
32 - AA - Arrow of Slaying
24 - BE - Endless Fusillade
13 - DWS - Aimed Shot + Sniper Shot
Shadar-kai are awful with terrible enhancements relative to their Dex race competitors halfling and drow (but especially halfling)... but there are literally 0 discretionary points! Hooray!
So we can use them for the only things they're good for:
- skipping levels 1 - 14
- not being a robot with alarmingly sharp edges in a crowded marketplace
- getting an inherent Dex bonus for the nearly irrelevant cost of Cha (since we have UMD as a class skill already).
It's worth noting I assume pretty serious tomes - but rejig stat points accordingly if you don't have them since nothing really matters as there are 0 DC dependent abilities. Every MOD of Int, which is, I suppose, the primary stat, is strictly +1 hit and +1 damage per bolt.
Starting Stats (36 point build; for 32 points, just note the minimum thresholds and plan accordingly, dropping Con to 14 or Int even lower as required):
STR 16 (+3 Level-ups at levels 16,20 and 24, +4 tome) = 23 for Overwhelming Crit qualification at 24.
DEX 16 (+5 tome) = 21 for Combat Archery at 21 and IPS at 15
INT 16 (+4 Level-ups at levels 4,8,12 and 28) to maximize skill points (and crossbow to-hit and damage) until we need to veer off to get Strength for OC: Ranged.
1 Rogue 1 Point Blank Shot
2 Ranger 1
3 Ranger 2 Completionist, [Rapid Shot] <-- If you don't have Completionist I like all of Quickdraw, Lightning Reflexes and Quicken as options.
4 Ranger 3
5 Ranger 4 Precise Shot
6 Ranger 5 Power Attack
7 Ranger 6
8 Artificer 1 Rapid Reload, [X-Bow Proficiencies]
9 Artificer 2 Cleave, [Rune Arm Use]
10 Artificer 3
11 Rogue 2
12 Rogue 3 Precision
13 Rogue 4
14 Rogue 5
15 Rogue 6 Improved Precise Shot
16 Artificer 4 [IC: Ranged] <-- worth noting that Precision is NOT an Artificer Bonus Feat else it would be here. If you don't have Completionist and opt for Quicken to fill that space, you can move Precision to level 3, IC: Ranged to level 12, and place Quicken here.
17 Rogue 7
18 Rogue 8 Great Cleave
19 Rogue 9
20 Rogue 10 [Improved Evasion]
Epic 1 Combat Archery
Epic 4 OC: Ranged
Epic 6 Toughness
Epic 7 Blinding Speed
Epic 8 Doubleshot
The AA Disclaimer:
Most AA abilities don't work on crossbows. "Ranged attacks" do though. So Inferno shot, Shattermantle Shot, Dispelling Shot, and Arrow of Slaying are all in. But there's a fair amount of unthrilling filler to hit the 30 AP threshold to take Arrow of Slaying.
The DWS Justification:
Headshot ain't all that.
Mercy shot ain't all that.
Battle Engineer and Mechanic at least speak for themselves I hope.
Skill points are a nightmare due to the different levels of different classes and whatnot. My hot tip is to max traps and UMD and bluff, then go nuts apart from that. If you feeling like a jaunt in Shiradi, I'd max diplo.
That's about it. Yay Shadar-Kai!