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Opportunity/Basic Attack Breakdown:  Most of the following offer OAs or basic attacks.  With Heavy Blade Opportunity, you can use your At Wills (both have the weapon keyword) for a basic attack.  This allows you to lay down a sanction via Ardent Strike, or start giving foes attack penalties via Sunspray Dance.  As long as you pre-buffed with Bless Weapon and have Divine Vengeance up (foe must be attacking an ally adjacent to you or attacking you for this extra damage) and/or have DC or DS up with the target being marked with Lawbreaker's Doom:
+36 Attack (+38 if target is slowed), 2d8 +1d6 + 1d10 + 28 + 11 (Divine Vengeance)
+36 Attack (+38 if target is slowed), 2d8 +1d6 + 1d10 + 35 + 39 (Marked w/DC and DV and LD)
+36 Attack (+38 if target is slowed), 2d8 +1d6 + 1d10 + 35 + 30 (Marked w/DS and DV and LD)

Target's that are marked with Lawbreaker's Doom that aren't slowed, are slowed with this attack, and target's that are already slowed are knocked prone (WSG).  As well, a lot of these require the target to ignore their marks, so they will also be weakened on the triggering attack.  If they are already prone on this attack, add a +5 to the damage.

Battle Awareness -- Basic attack when a foe shifts or when an attack is made without being the target.  

Dispensed Justice -- hit a target of Lawbreaker's Doom...will knock them prone, and between this power and if they are DC'ed, they take a -5 penalty to hit

Divine Vengeance -- Not technically an Immediate Interrupt but auto radiant damage when you or nearby allies are attacked...and can add to many of your interrupts if an attacked ally is adjacent to you.  Deals 11 radiant damage.

Exalted Retribution -- Basically a save ends OA versus the target whenever they attack as an effect of the power

Foe Caller Gauntlets -- teleport a marked target attacking an ally to you and make a melee basic attack

Backlash Tat -- Basic Attack as an immediate reaction when bloodied

Mass Marking/Sanctions:

Call of Challenge -- mass DS
Red Death -- mass mark, extra damage versus targets with your attacks (+6), w/possible slow/prone
Castigating Strike -- mass DS

Area Effects/Control:

Powerful Faith -- mass blind
Stunning Smite -- mass stun -- and as long as you haven't missed every target, you can do this every round
Champion's Call -- mass pull w/possible immobilize
Divine Vengeance -- damage to foes hitting adjacent allies
Shining Symbol -- mass -2 to hit
Blood Oath Fulfilled -- mass prone -- save ends
Warsheath Armor -- pull foes within a number squares equal to armor bonus adjacent to you -- good set up for a few abilities/combos

Survival:

Lay on Hands -- 6 uses
Virtue - THP baby
Return to the Living -- Get out of 0 hit points free card
This Is Not My Fate -- When making a death save, go back to bloodied HPs, end all effects on you and stand up
Virtuous Recovery -- 6 resist whenever you spend a healing surge
Strength of Conviction -- Gain 18 temporary hit points whenever you take down a target of Lawbreaker's Doom

Action Point Fun:

When spending an action point to gain an extra action, you can regain the use of a divine encounter power that has been used, and you can immobilize the target of your Lawbreaker's Doom power if you use that extra action to attack and hit the target with the attack.

Marking and Mark Punishment:

-5 from Sunspray Dance/DC to single target (Effectively -8 w/Sanctifying Word for allies in your zone of effect)...can also pull off a similar effect on multiple targets in a burst w/Shining Symbol/Red Death/Sanctifying Word

Single target takes Extra Damage (+6) and is slowed from Lawbreaker's Doom

Slowed Targets knocked prone from WSG -- Good single target lockdown w/Lawbreaker's Doom/Sunspray Dance/DC

Mighty Challenge (+8), Divine Challenge (+13), Divine Vengeance (+11 and ally must adjacent to you), Symbol of the Champion's Code (+6) gives 38 Radiant Damage for ignoring Mark and foe Weakened against allies on triggering attack versus ally (Weakening Challenge) -- Single Target, and can slide the foe by 1 square

Paladin's Truth -- Ignore Resistance/Immunities of Marked foes

-3 from Red Death (Effectively -6 w/Sanctifying Word for adjacent allies) and Burst Attack w/slow on targets in the burst

Divine Sanction (+13), Divine Vengeance (+11 and ally must adjacent to you), Symbol of the Champion's Code (+6) gives 30 Radiant Damage for ignoring Mark and foes Weakened against allies on triggering attack versus ally (Weakening Challenge) -- Single/Multi Target, and can slide the foe by 1 square

Possible mass prone w/Red Death and burst attack combos (+5 damage to prone foes w/attacks from your heavy blade)

Can sanction with Opportunity/Basic Attacks via Heavy Blade Opportunity and Ardent Strike.

Sanctifying Word (w/Mark of Warding) adds +3 to allies defense within your zone (w/mark of warding), as well as an additional 5 to their healing surge value and 5 radiant damage to any undead in the zone.  This combined with marks, mark of warding, and -2 to hit abilities (Shining Symbol, Sunspray Dance) are effectively giving your foes a -8 to hit allies that are in SWs zone of effect (with only -2 of this affecting the character directly).

Defenses at 30:

AC - 47
Fort - 44
Refl - 45
Will - 45
(If the attacker was hit with Sunspray Dance/Shining Symbol, they will take a -2 to hit you.)