Note:
I am contemplating the possibility of transforming this build into a Dragon Lord T5/Swashbuckler using hand axes, for the strong weapon crit profile it can reach:
15-20/x5
→ Critical threat range
Base
> 20: Hand Axes
Feats
> +1 feat bonus: 'Improved Critical: Slashing' (feat)
Heroic enhancements/spells
> +2 competence bonus: Bard's 'Swashbuckling* [C3]' {base bonus}
> +2 competence bonus: Bard's 'Swashbuckling* [C3]' {*doubled bonus if you have the IC feat}
= 15-20
→ Critical damage multiplier
Base
> x3: Hand Axes
Heroic enhancements/spells
> +2 competence bonus: Dragon Lord's 'Conqueror [T5]'
= x5
→ Crit damage multiplier boosts = +1
Epic Destinies
> +1 on 19-20 rolls: Fatesinger's 'Blade Song [T5]'
= x6
→ Expanded Vorpal threat range = +1 (19-20)
Feats
> +1: 'Perfect Single Weapon Fighting' (feat)
I have not done any detailed planning, just brainstorming some possibilities:
>
Bard 15/
Dragon Lord 5?
>
Bard 14/
Dragon Lord 6?
Either option would remove the trapping aspect of the build.
>
Bard 12/
Dragon Lord 6/
Rogue 2?
Perhaps removing the bard + the caster hybrid aspects completely, and being fully melee focused?
>
Dragon Lord 15/
Bard 3/
Rogue 2?
Perhaps leave this build as is, since it's great fun to play, and make a new alt?
Whichever choice I take, it would take a me a while to get this properly planned + at endgame in the live game, but it looks like it will make a fun variation with a slightly similar playstyle to the one I have now.
In the meantime, below are notes ref U66 changes for the build as it currently is:
U66 changes (updated in the forums and DDOBuilder file)
Basically no active changes required for this build.
> The key passive changes all seem positive:
- Fatesinger
- Core abilities now grant +15 HP
- DC for Discord abilities (melee/ranged) is now 20 + highest mod + stun DC
- DC for Discord (spell) is now 20 + highest of int/wis/cha + evocation DC
- Little bit of Music and Master the Acoustics have swapped places in the tree
- Shadowdancer
- Core abilities now grant +15 HP and +25 SP.
- Machrotechnic
- The cooldowns of the Hammer Time spells and the damaging Epic Strikes have swapped places - leaving the Sonic and Electric Epic Strikes at 10 seconds and the Hammer spells at 15 seconds.
All in all, the build is good to go as is

Enjoy!