So the reason I'm using wakizashi here is that the default damask versions have a bonus damage type that do not match the weapon's base damage type, so they fully stack with Bless Weapon. Bless Weapon on a Masterly Damask Wakizashi, for example, nets 11 physical damage.Stealthy Ninja Paladin (26 Vengeance / 4 Rogue, Human)
Weapon of Choice: Wakizashi
STR 13
DEX 16 (18 gift) -> 24
CON 10
INT 13
WIS 8
CHA 15 (17 gift) -> 18
1R Power Attack, Expertise
2R [Free: Finesse]
3R Exotic Weapon Proficiency
6P Divine Shield
9P Weapon Focus: 1H [Free: Extra Smiting]
12P Imp. Critical: 1H
15P Imp. Expertise
18P Blind Fight
19P [Free: Divine Might, Great Smiting I]
21P Epic Weapon Focus
24P Spell Focus: Abjuration
26P [Paladin Bonus: Armor Skin]
27P Greater Spell Focus: Abjuration
29R <- Skill Dump
30P ESF: Discipline, [Paladin Bonus: Epic Prowess]
51 AB: 24 BAB + 13 DEX + 3 T3 Pal + 5 Weapon + 4 Feats + 2 Bless/Aid
63 AC, 73 AC /w Imp Expertise: 10 Base + 16 Cloth/Dex + 2 Armor Skin + 6 Tumble + 1 Boots + 1 MA + 3 Helmet + 4 Barkskin + 6 Shield + 4 Haste + 10 Divine Shield
44.5 Average On-Hit Damage: 4.5 Wakizashi + 6 Slashing + 5 Piercing + 4 STR (No gear, just +5 from Bull's) + 12 Divine Might + 3 T3 Oath + 6 Deafening Clang + 4 Perm Essence
240 Skill Points: 33 Disc, 30 Tumble, 32 Hide / MS, 33 Leadership, 25 UMD, 25 Lore, 30 Parry (for the 1h Wakizashi aesthetic) or Concentration (boring option; I'd use Enchanted Shield to minimize the armor check penalty to stealth and pilfer 3 points from Lore)
That might change, depending on whether the devs see this is a bug or just something that needs fixing! If so, either a Dead Man's Cross or a Black Scepter can work as well for stacking damage, or one can simply stick with the wakizashi for thematics.
A rapier also works if I want to go the route of a swashbuckling paladin, similar to the investigator prelate NPC from Sembia in the Radiant Heart.
In any case, please do let me know if I've made any major errors in the build above or if I've missed anything critical!