If you looked at the Excalibur video, you'll notice that two different damages were recorded. Each weapon seems to have an 1) additional effect, 2) a triple DMG activation, and an 3) after effect when the weaponskill is used.
Additional Effect on Excalibur = Damage proportionate to current HP (375 DMG in video)
Triple Damage = 456 Triple Damage process
After WS effect = After using KoR, the player receives Regen of 10 HP / 3 sec.
If you checked out Apocalypse, you'll notice it has the same setup too.
Additional Effect on Apocalypse -
Blindness process
Triple Damage -
457 Triple Damage and
633 Triple Damage (with critical)
After WS effect - Drains target's HP. Additional Effect: Haste
Repost of the effects after WS, if you've missed it before.
All WS info was extracted from the .DAT files by Faranim using FFXITool.
Final Heaven - Additional Effect: temporarily enhances Subtle Blow effect.
Mercy Stroke - Additional Effect: temporarily improves critical hit rate.
Knights of Round - Additional Effect: Regen
Scourge - Additional Effect: temporarily improves critical hit rate.
Onslaught - Lowers target's Accuracy. Additional effect: temporarily increases Attack.
Metatron Torment - Lowers target's defense. Additional effect: temporarily lowers damage taken from enemies
Catastrophe - Drains target's HP. Additional Effect: Haste
Geirskogul - Additional effect: Shock Spikes.
Blade: Metsu - Additional Effect: temporarily enhances Subtle Blow effect.
Tachi: Kaiten - Additional Effect: temporarily increases amount of TP stored with each hit.
Randgrith - delivers a Shield Break attack. Additional effect: temporarily improves Accuracy.
Gate of Tartarus - Lowers target's Attack. Additional effect: Refresh
Namas Arrow - Additional effect: temporarily improves Ranged Accuracy.
Coronach - Additional effect: temporarily lowers enmity.
WTF, Shock Spikes?
The fully upgraded Relic horn adds +2 to every song.
The 4th Stage relic horn "Millenium Horn" is +2 to each song as everyone knows. However, that +2 on Ballad IS INFACT +2 mp to EACH ballad song. Ballad I is now 3 mp a tick, Ballad II is now 4 mp a tick. IRON on Bismarck, an NA LS, has upgraded the horn and has proof that it is indeed 7mp a tick now with both ballads. I'll redo this video this Sunday with him using Soul Voice as well, but until then here's this (Soul Voice + Refresh was 17mp a tick).
Relic Horn's effect on Ballad