| 5–20 | Uncommon | Lv 5 | - Double Hit deals +6% damage and hastens the current reuse timer of Headcracker by 1 second
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| 10–25 | Uncommon | Lv 10 | - Double Hit deals +8% damage and hastens the current reuse timer of Headcracker by 1 second
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| 15–30 | Uncommon | Lv 15 | - Double Hit deals +10% damage and hastens the current reuse timer of Headcracker by 1 second
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| 20–35 | Uncommon | Lv 20 | - Double Hit deals +12% damage and hastens the current reuse timer of Headcracker by 1 second
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| 25–40 | Uncommon | Lv 25 | - Double Hit deals +14% damage and hastens the current reuse timer of Headcracker by 2 seconds
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| 30–45 | Uncommon | Lv 30 | - Double Hit deals +16% damage and hastens the current reuse timer of Headcracker by 2 seconds
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| 35–50 | Uncommon | Lv 35 | - Double Hit deals +18% damage and hastens the current reuse timer of Headcracker by 2 seconds
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| 40–55 | Uncommon | Lv 40 | - Double Hit deals +20% damage and hastens the current reuse timer of Headcracker by 2 seconds
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| 45–60 | Uncommon | Lv 45 | - Double Hit deals +22% damage and hastens the current reuse timer of Headcracker by 2 seconds
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| 50–65 | Uncommon | Lv 50 | - Double Hit deals +24% damage and hastens the current reuse timer of Headcracker by 2 seconds
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| 55–70 | Uncommon | Lv 55 | - Double Hit deals +26% damage and hastens the current reuse timer of Headcracker by 2 seconds
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| 60–75 | Uncommon | Lv 60 | - Double Hit deals +28% damage and hastens the current reuse timer of Headcracker by 2 seconds
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| 65–80 | Uncommon | Lv 65 | - Double Hit deals +30% damage and hastens the current reuse timer of Headcracker by 2 seconds
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| 70–85 | Uncommon | Lv 70 | - Double Hit deals +32% damage and hastens the current reuse timer of Headcracker by 2 seconds
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| 75–90 | Uncommon | Lv 75 | - Double Hit deals +34% damage and hastens the current reuse timer of Headcracker by 2 seconds
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| 80–95 | Uncommon | Lv 80 | - Double Hit deals +36% damage and hastens the current reuse timer of Headcracker by 2 seconds
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| 85–100 | Uncommon | Lv 85 | - Double Hit deals +38% damage and hastens the current reuse timer of Headcracker by 2 seconds
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| 90–105 | Uncommon | Lv 90 | - Double Hit deals +40% damage and hastens the current reuse timer of Headcracker by 2 seconds
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| 95–110 | Uncommon | Lv 95 | - Double Hit deals +42% damage and hastens the current reuse timer of Headcracker by 2 seconds
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| 100–115 | Uncommon | Lv 100 | - Double Hit deals +44% damage and hastens the current reuse timer of Headcracker by 2 seconds
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| 105–120 | Uncommon | Lv 105 | - Double Hit deals +46% damage and hastens the current reuse timer of Headcracker by 2 seconds
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| 110–125 | Uncommon | Lv 110 | - Double Hit deals +48% damage and hastens the current reuse timer of Headcracker by 2 seconds
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| 115–130 | Uncommon | Lv 115 | - Double Hit deals +50% damage and hastens the current reuse timer of Headcracker by 2 seconds
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| 120–135 | Uncommon | Lv 120 | - Double Hit deals +52% damage and hastens the current reuse timer of Headcracker by 2 seconds
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| 125–140 | Uncommon | Lv 125 | - Double Hit deals +54% damage and hastens the current reuse timer of Headcracker by 2 seconds
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