Saber artema bug?

[Mawle Jahy]

Is Artema sword bug? is not doing the damage it should if its damage is focused on the wearer's HP
character information
Celes Lv 80
HP: 8211
Artema Weapon Damage: 4317 per hit

https://imgur.com/a/LK3FVBU (Equipament and stats)

Correct me if I'm wrong please

[Blissful Winds]

The culprit is the "Pergamino maestro" (Master's Scroll). Attacks with the Master's Scroll equipped cause the weapons to deal 50% less damage, but the weapon deals four hits. This is not a bug, but an intention of the relic. This is why you are doing a little more than half the damage on your ultima weapon with each hit. The total damage is a little more than twice your HP.

[Mawle Jahy]

Omg is true! But in the gba version it does not happen
Let me add another data on the subject, I put that the character is with 8211 HP, if that character receives damage and his HP is reduced to 8000 for example, the damage of artema increases considerably

[Blissful Winds]

There are several factors that influence how the atma weapon behaves, but remaining HP is only a factor until a specific level threshold is met, along with a few other means. I'm sure a FAQ exists with those specifics, but the major factor in your damage 'loss' is the master's scroll.