To break it down in slightly more detail...BoM has no Arc requirements whatsoever.

It has Base 120 Physical and 60 Arc Damage at +10.

No Strength Scaling Coefficient, but it has a 1.1 SC in Skill and a 0.69 SC in Arcane.

Now, Scaling is a coefficient of the base damage. So BoM's Arc only hitting 60 at +10 is what limits it.

AR is determined by 3 factors being multiplied by each other:

Base Damage * Scaling Coefficient * Attribute Saturation(your stat)

AS can be summarized as this, at 25 in a damage stat, your AS is 0.5 or 50%.

At 50 in a damage stat, your AS is 0.85 or 85%. And then at 99 your AS is 1 or 100%.

From 0 to 25 you hit 50%, from 26~50 you hit 85% and then from 51~99 you slog your way over to 100%.

This is why 25 and 50 in Damage Stats are viewed as the scaling softcaps save for Arcane/Bloodtinge Tool Scaling.

Let's plug those into the BoM.

60 Base Arc * 0.69 Arcane Scaling Coefficient * 0.50 from 25 in Arcane = 20.7, so you'd have about 80~81 Arcane Damage.

60 * 0.69 * 0.85 = 35.19 so you'd have a whopping 95~96 Arcane Damage at 50 Arc.

60 * 0.69 * 1 = 41.4 so a grand total of 101~102 Base Arcane Damage at 99 Arc.

The returns on leveling Arcane for Blades of Mercy, even when you hard cap Arcane, are paltry at best.

Think of it as having a constant Empty Phantasm Shell effect on your weapon preventing you from using papers.

Even if you did roll a Nourishing Gem setup, you'd barely be outdamaging a physical setup if at all pending enemy resistances because of split damage defense issues and in using Nourishing, you'd be losing out on extra Visceral damage compared to if you just stuck 3x 27.2s on it and called it a day.

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