What you do on a barb is splash at least 2 cleric for destruction domain to open up cleric scrolling, and a UMD class to open up UMD, preferably arti for the scroll caster level and trapping.
You level cleric when you want more healing and turning power (seek eternal rest level 2 spell), arti when you want more trapping, and barb when you don't need either of the other 2.
Feats are PA>Cleave>GCleave>THF > IC > THF#2 > THF#3
Your skills are:
When leveling cleric: heal/concentration/umd
When leveling barb: some jump/some balance/umd/some intimidate
When leveling arti: trapping/umd
Enhancements are Divine Might > Divine healing + Mighty Turning +W&S Mastery from Radiant Servant > then whatever you want from any other tree.
~14 all starting stats, levels in strength, unless you will need more cha for UMD heal scrolls at 9. Can drop dex/wis a few points for more strength/cha.
Your goal is no-fail UMD heal scrolls at level 9.
My character was 3 arti 3 cleric 3 barb at 9, then just sorta wing it to cap. A No Worries or Thick Skin level 5 armor from anniversary party with moderate fort slotted will work well early levels. Returning throwing hammer for perched skeleton archers/reapers.
Stunning blow doesn't work on reapers, so if you do reaper at higher levels and difficulties you will need ear smash.
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Archery is godly low-moderate heroic reaper with a good heroic build+gear. it is also godly in high epic reaper, but requires a different build. It falls off at higher level heroics when mobs have tons of HP/fort saves.
--- GS random slay living bow (falls off approaching level 15) or triple ice freezing bow (falls off approaching cap) + vorpal stalker ring + frozen tunic + warlock level for -4 fort save debuff
9 Ranger, 4 warlock, 1 FVS (delay till after IPS at 12) charisma based. This gives charm/suggestion for reaper mode, fort debuff from SE, a ton of enchantment DC from AA tree. IPS at level 12. 9d6 force AA + 3d4 more light damage die from ES. The single FVS level is for divine might (bow strength), command spell for CC, and scourge, which fuels your force/light spell power passively from ES aura. UMD, temp hp.
Mix the 4 warlock levels in at 4,5,7,8 when you can't advance up the AA tiers. Most of your damage is imbue/instant kills/charms, so freezing for helpless/instant kill bow is better than a crit one. Since you already have vorpal on ring though, you want bow to be non-vorpal, like a random slay living proc from --- GS, or freezing ice GS to stack with lesser/minor freezing ice on tunic.
The primary problem with bows isn't that they are weak in heroic, but instead the high cost to make a GS/alchemical weapon to synergy with your vorpal stalker ring and imbues by having non-vorpal instant kills or inducing helpless at a reasonable DC. The second problem is that the good epic builds are totally different than good heroic builds, so you don't have a strong build 1-30 like a pure 20 warlock.