About Student of Caiphon needing Errata? Daggermaster is just as bad, if not more so, then Student of Caiphon. SoC forces the person to use Radiant powers/enchantments while Daggermaster forces the person to use Daggers as their weapon.
Lord Priest Syphos the Terrible, level 16
Half-Elf, Avenger, Student of Caiphon
Avenger's Censure: Censure of Pursuit
Pact Initiate: Pact Initiate (star pact)
Heh, I'll see the standard Half-elf cheese with a different take on the Half-elf Cheese.
====== Created Using Wizards of the Coast D&D Character Builder ======
Hermit Aidendale the Woodsmen Hunter, level 16
Half-Elf, Avenger, Student of Caiphon
Avenger's Censure: Censure of Unity
Pact Initiate: Pact Initiate (star pact)
FINAL ABILITY SCORES
Str 9, Con 14, Dex 16, Int 11, Wis 20, Cha 20.
STARTING ABILITY SCORES
Str 8, Con 11, Dex 15, Int 10, Wis 16, Cha 14.
AC: 32 Fort: 25 Reflex: 26 Will: 28
HP: 118 Surges: 9 Surge Value: 29
TRAINED SKILLS
Religion +13, Perception +20, Stealth +20, Acrobatics +16, Insight +20
UNTRAINED SKILLS
Arcana +10, Bluff +13, Diplomacy +15, Dungeoneering +13, Endurance +10, Heal +13, History +8, Intimidate +13, Nature +13, Streetwise +13, Thievery +11, Athletics +7
FEATS
Level 1: Weapon Proficiency (Urgrosh)
Level 2: Pact Initiate
Level 4: Improved Armor of Faith
Level 6: Weapon Expertise (Axe)
Level 8: Two-Weapon Fighting
Level 10: Power of Arcana
Level 11: Versatile Master
Level 12: White Lotus Riposte
Level 14: Two-Weapon Opening
Level 16: White Lotus Master Riposte
POWERS
Avenger at-will 1: Radiant Vengeance
Avenger at-will 1: Overwhelming Strike
Dilettante: Virtuous Strike
Avenger encounter 1: Avenging Echo
Avenger daily 1: Temple of Light
Avenger utility 2: Distracting Flare
Avenger encounter 3: Bound by Fate
Avenger daily 5: Oath of Consuming Light
Avenger utility 6: Step of Fate
Avenger encounter 7: Celestia Endures
Avenger daily 9: Temple of Shadow
Avenger utility 10: Ever Onward
Avenger encounter 13: Dervish Strike (replaces Bound by Fate)
Avenger daily 15: Aspect of Fury (replaces Temple of Shadow)
Avenger utility 16: Astral Cloak
ITEMS
Holy Symbol, Rending Urgrosh +3, Symbol of the Warpriest +3, Magic Feyweave Armor +4, Piwafwi +4, Bracers of Mighty Striking (heroic tier), Boots of the Fencing Master (heroic tier), Cannith Goggles (heroic tier)
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No Radiant Weapon for this version, so only attacks with the Radiant Keywords gets the critical range. Though fortunately, Virtuous Strike does contain the Radiant Keyword and it is a basic attack. Less defenses then the Twin Strike you showed, especially in Fort, but the little advantages in the build are really useful.
The main attack is Virtuous Strike, so I'll walk through what happens. Attacking your OoE lets you have that almost 30% chance of critting. If you land a critical with Virtuous Strike, you get two free attacks(Rending and Two Weapon Opening) with Virtuous Strike(Melee Basic Attack) with each side of the Urgosh. If you crit with the d12 side of the Urgosh, you get another two free attacks with each side of the Urgosh. If you crit with the d8 side of the Urgosh you get one free attack(whether you can go and use this on the d12 side is up to debate so I'll assume no).
So we have the chance of Chaining Criticals, but that still doesn't make it have a lead over Twin Strike version just yet. That is where the "Power of Arcana" feat comes in. Not only is Virtuous Strike a Divine power that counts as a melee basic attack, but now it also counts as Arcane and gives +1 to attack rolls to its and Radiant Vegeance's attack rolls until the end of your next turn just by being used. Not only that, but it also now allows White Lotus Riposte and Master Riposte to work with Virtuous Strike.
So you hit/crit your target with Virtuous Strike, now the foe is going to take x*5(Cha) radiant damage if they attack you where x is the number of times you hit the target with Virtuous Strike. On top of allowing you to repeat Virtuous Strike and its possible repetitions in Criticals as an Immediate Reaction.
Number wise? Its a 27.75% chance to see at least three attacks, a 15.4% chance to see at least four attacks, a 9.8% chance to see at least five attacks....and so on each time you first use Virtuous Strike(Whether by Standard Action, Immediate Reaction, or OA).
That +2 bonus to saving throws until the end of your next turn may never be needed, but having that +2 cumulate with each possible Virtuous Strike attack that hits just may help ya make a Save when you need it. That +2 bonus is untyped after all. Also, that +1 attack roll bonus to Arcane powers from "Power of Arcana" is also untyped, meaning you get a cumulative +1 to Virtuous Strike attack rolls until the end of your next turn each time Virtuous Strike is used. Note that the bonus comes from using Virtuous Strike, not hitting/critting with Virtuous Strike.
Yes, Censure of Unity with its +2 damage for each ally adjacent to the target sounds really nice. Also nice to know that Radiant Vengeance also is included in the White Lotus feats with Power of Arcana.