Nah no worries, but yeah.
My former build with Excalibur before implementing Reaper, was to use Energize and Molt Augmented, combined with Surging Dash and Furious Javelin Augment Mods. I have Blind Rage, all 3 Umbral Mods for a total of 77% Ability Strength, and Energy Conversion for an additional 50% on Energy Orb pickup.
Using Furious Javelin on a group to get around 500-1K bonus melee damage, and then using Slash Dash would net me around 1.4-1.6M on Armored enemies. Because I use Tharros Strike to strip armor, it nets around 2M+ with it.
That brings another issue I have with Slash Dash and Arcane Reaper not synergizing, because Furious Javelin, the Augment Mod increases the Damage of all melee weapons, and that INCLUDES Slash Dash, but Arcane Reaper ≠Slash Dash for some reason...?
Respectfully disagreeing here, should work regardless of lore/in game perspective. Furious Javelin works for all melee weapons, and that includes Slash Dash, but Arcane Reaper doesn't work for some bizarre reason.