Digimon: How Powerful Is Kaiser Nail? WereGarurumon’s Mountain-Cutting Feat Analyzed

Digimon Adventure episode 28

Kaiser Nail is the technique WereGarurumon uses to defeat his enemies. In one of his most impressive feats, he is shown cutting through part of a mountain. In this post, we will attempt to determine how powerful this technique is and estimate its speed, based on the feat presented in Episode 28 of Digimon Adventure.

Mountain Dimensions

At the top of the mountain stands Vamdemon’s Castle, which we will use as a reference point to estimate the mountain’s size. Although there is no official data regarding the castle’s dimensions, we can establish a reasonable minimum estimate based on the Digimon present there.

For example, Megadramon appears in this location and is depicted with a length comparable to the Tokyo Rainbow Bridge, which measures 798 meters in total length, with a 570-meter central span. Megadramon is shown occupying at least half of that distance—approximately 250 meters.

Assuming Megadramon could fit within one of the many chambers of the castle, it is reasonable to use this measurement as a baseline estimate for the size of Vamdemon’s Castle.

Digimon Adventure episode 28

Mountain Volume Estimation

To keep the results conservative and within a reasonable range, we will use 250 meters as the estimated length of the castle.

Castle size: 100 px = 250 meters

Base diameter: 400 px = 1,000 meters

Upper diameter: 115 px = 287 meters

Cone height: 235 px = 587 meters

We model the mountain as a truncated cone to estimate its total volume:

$V = \frac{1}{3} \pi h (R_1^2 + R_2^2 + R_1 R_2)$

Substituting the values:

$V = \frac{1}{3} \pi \times 587 \times (500^2 + 143.5^2 + 500 \times 143.5) \approx 3.1 \times 10^8 \text{ m}^3$

However, only the outer rock layer of the mountain was fragmented, while the inner cylindrical core remained intact.

The volume of this inner cylinder is:

$V = \pi \times 143.5^2 \times 587 \approx 3.8 \times 10^7 \text{ m}^3$

Subtracting this preserved core from the total truncated cone volume:

$V \approx 3.1 \times 10^8 - 3.8 \times 10^7 \approx 2.7 \times 10^8 \text{ m}^3$

Using an average hard rock density of 2,500 kg/m³, the total displaced mass becomes:

$M = 2.7 \times 10^8 \times 2,500 \approx 6.8 \times 10^{11} \text{ kg}$

This represents the approximate mass of rock dislodged by Kaiser Nail.

Kaiser Nail

Digimon Adventure episode 28

Energy Estimation

The attack affected only one side of the mountain and a relatively small portion of it. To estimate the destroyed section, we first determine the circumference of the upper section, which has a diameter of 287 meters:

$C = \pi \times 287 \approx 900 \text{ meters}$

Only half of the circumference was impacted, resulting in approximately 450 meters of affected arc length.

Two additional dimensions are required: height and depth. Fortunately, the animators reused the same background frame, maintaining consistent mountain proportions.

Height of affected section: 250 meters

Depth of cut: 120 meters

Attack travel distance: 850 px = 2,125 meters (used later to estimate speed)

The volume of destroyed rock is therefore:

$V = 450 \times 250 \times 120 = 13,500,000 \text{ m}^3$

Using a rock density of 2,500 kg/m³, the total mass becomes:

$M = 13,500,000 \times 2,500 = 33,750,000,000 \text{ kg}$

Wolf Claw exhibits characteristics of vaporization, pulverization, and fragmentation, so we apply the previously used value of 39,554 J/kg (from the Gamera analysis), which is suitable for similar large-scale destructive events.

$E = 33,750,000,000 \times 39,554 = 1.14 \times 10^{15} \text{ joules}$

This corresponds to approximately 272 kilotons of TNT.

This result maintains internal consistency within Digimon power scaling, aligning with the ~220 kilotons estimated for SkullGreymon’s missile and the ~1 megaton yield calculated for MegaKabuterimon. We will evaluate whether subsequent estimates continue to support this range

Speed Estimation

Again, the consistent background framing allows for reliable scaling.

The attack travels 2,125 meters in approximately 0.5 seconds:

$v = 2,125 / 0.5 = 4,250 \text{ m/s}$

This corresponds to roughly Mach 12.

Such velocity is significant and remains consistent with the high-speed combat feats demonstrated throughout the series.

Conclusion

Based on volumetric scaling and fragmentation energy, WereGarurumon’s Wolf Claw reaches yields around 270 kilotons of TNT, with speeds near Mach 12. This firmly places the attack within high nuclear-level destructive power, consistent with upper-tier Champion and Ultimate Digimon scaling in Digimon Adventure.

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