For the Honour mode I'm quite enjoying a Sword Bard 6 / Blade Warlock 3 / Oath of Devotion Paladin 3.
Unfortunately in practice its a respec build I guess. And Warlock is the least critical part. On the other hand, I started with Warlock, so I prefer to keep it. And Blade Pact + Gloves of Dexterity mean I only need to worry about Charisma and, to a lesser dgree, Con. Plus Mirror Image, Armor of Agathys, Misty Step and the occassional Hellish Rebuke are nice. Oh and Mortal Reminder on crits.
Slashing Flourish + Bhaalist Armor Aura of Murder + Nyrulna is pretty cool
....can also get guaranteed crits (Luck of the Far Realms + Killer's Sweetheart), smites and even paralyse (Surgeon Subjugation Amulet) on bosses...