From the Abyss Tuning Device

[From the Abyss]damage +10%.

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Grade D or higher:

[From the Abyss]damage +7% additional.

Grade C or higher:

Magical damage against all sizes +10%.

Grade B or higher:

[From the Abyss]damage +8% additional.

Grade A or higher:

[From the Abyss]damage +10% additional.