Slightly optimized version of Pax...

====== Created Using Wizards of the Coast D&D Character Builder ======
Pax 2.0, level 21
Elf, Ranger, Battlefield Archer, Destined Scion
Build: Archer Ranger
Epic Heroism Option: Wisdom
Epic Heroism Option: Dexterity
Fighting Style Option: Archer Fighting Style
Ranger Option: Prime Shot
Auspicious Birth (Auspicious Birth Benefit)
Theme: Noble Adept

FINAL ABILITY SCORES
STR 12, CON 13, DEX 28, INT 12, WIS 24, CHA 10

STARTING ABILITY SCORES
STR 10, CON 11, DEX 18, INT 10, WIS 14, CHA 8


AC: 39 Fort: 26 Ref: 34 Will: 35
HP: 140 Surges: 7 Surge Value: 35

TRAINED SKILLS
Acrobatics +23, Athletics +15, Nature +24, Perception +24, Stealth +27, Thievery +23

UNTRAINED SKILLS
Arcana +11, Bluff +10, Diplomacy +10, Dungeoneering +17, Endurance +10, Heal +17, History +11, Insight +17, Intimidate +10, Religion +11, Streetwise +10

POWERS
Basic Attack: Melee Basic Attack
Basic Attack: Ranged Basic Attack
Noble Adept Feature: Adept's Insight
Elf Racial Power: Elven Accuracy
Hunter's Quarry Power: Hunter's Quarry
Ranger Attack 1: Twin Strike
Ranger Attack 1: Nimble Strike
Ranger Utility 2: Invigorating Stride
Ranger Attack 3: Disruptive Strike
Ranger Utility 6: Weave Through the Fray
Rogue Attack 7: Snap Shot
Ranger Attack 9: Attacks on the Run
Ranger Utility 10: Defensive Volley
Battlefield Archer Attack 11: Combined Fire
Battlefield Archer Utility 12: Archer's Glory
Ranger Attack 15: Confounding Arrows
Ranger Utility 16: Wary Shooter
Ranger Attack 17: Pounding Barrage
Ranger Attack 19: Surprising Arrow Stance
Battlefield Archer Attack 20: Quarry's Bane

FEATS
Defensive Mobility
Weapon Proficiency (Greatbow)
Level 2: Bow Expertise
Level 4: Weapon Focus (Bow)
Level 6: Sneak of Shadows
Level 8: Treetop Sniper
Level 10: Wintertouched
Level 11: Lasting Frost
Level 12: Novice Power
Level 14: Prime Slayer
Level 16: Called Shot
Level 18: Superior Will
Level 21: Bow Mastery
Level 21: Improved Prime Shot

ITEMS
Hide Armor
Adventurer's Kit
Longsword
Arrows
Gloves of Ice (paragon tier) x1
Elven Chain Shirt (paragon tier)
Siberys Shard of Merciless Cold (paragon tier)
Boots of Striding x1
Potion Bandolier x1
Ring of Giants x1
Ring of Invisibility x1
Elixir of Invisibility (heroic tier)
Potion of Spectral Form
Frozen Whetstone (paragon tier)
Vial of Darkness
Elixir of Levitation
Elixir of Water Breathing (heroic tier)
Elixir of Flying (epic tier)
Handy Haversack
Endless Quiver
Frost Greatbow +4 x1
Bracers of Archery (paragon tier) x1
Displacer Darkhide Armor +4 x1
Torc of Power Preservation +4 x1
Casque of Tactics (paragon tier) x1
Backlash Tattoo x1
Dice of Auspicious Fortune
====== End ======

*** AtWill DPR ***
+28 toHit Base
+30 toHit with CA
+32 toHit with CA and PrimeShot

Damage:
+4Enhancement +4Item +5ColdVuln +4Gloves +3Feat +3Shard (+2Prime +5Called)

First Hit: DPR 58.93 (if no allies are closer 76.78)
+4Enhancement +4Item +4Gloves +3Feat +3Shard (+2Prime +5Called)
+28 toHit (+30 if no allies are closer)
2d12+18 (+7 if no allies are closer)

Subsequent Hit: DPR 73.58 (if no allies are closer 84.78)
+4Enhancement +4Item +4Gloves +3Feat +3Shard +5ColdVuln (+2Prime +5Called)
+30 toHit (+32 if no allies are closer)
2d12+23 (+7 if no allies are closer)


Damage Bonus Sources:
+9 (Dexterity)
+5 (Lasting Frost)
+4 enhancement (+4 weapon)
+4 item (Bracers of Archery)
+4 (Gloves of Ice)
+3 feat (Weapon Focus)
+3 (Siberys Shard of Merciless Cold)
+5 (Called Shot)
+2 (Prime Slayer)

Assumes you've hit the target last round and have prime shot adds

Minor Action: Hunter's Quarry
Standard Action: Twin Strike +32 toHitAc 2d12+30, 2d12+30 (83.60)
Move as Minor Action – Snap Shot +32 toHitAc 1d12+39 (43.30)
AP: Pounding Barrage +32 toHitAc 1d12+39, 1d12+1d6+39, 1d12+39 (132.53)
Hunter's Quarry 3d6 cold damage (10.5)
Sneak Attack 5d6 cold damage (17.5)

Total Damage: 6d12+9d6+216 cold damage (DPR 287.43)

Assumes you've hit the target last round and have prime shot adds

Minor Action – Hunter's Quarry
Standard Action – Confounding Arrows (141.38)
   +32 toHitAc 1d12+39 cold damage
   +32 toHitAc 1d12+39 cold damage
   +32 toHitAc 3d12+39 cold damage
Move as Minor Action: – Snap Shot +32 toHitAc 1d12+39 (43.30)
AP: Pounding Barrage (132.53)
   +32 toHitAc 1d12+39 cold damage
   +32 toHitAc 1d12+1d6+39 cold damage
   +32 toHitAc 1d12+39 cold damage
Hunter's Quarry 3d6 cold damage (10.5)
Sneak Attack 5d6 cold damage (17.5)

Total Damage: 9d12+9d6+273 (DPR 345.21)