Ren's hydra fired light rays that were particularly devastating against mutants.
There was a strange inherent purification not just in the element but in how it interacted with corruption. Damage exceeding what raw power alone would explain. Like the light was somewhat countering whatever twisted the beasts from their natural forms.
When the hydra was charging and didn't use light, it crushed the beasts between rocks. That was what cost it least thanks to the beast's extra affinities in both light and earth. A combination that allowed it to control considerable mass without draining reserves excessively. Large stones sandwiched targets with huge acceleration.
Simple but brutally effective at that level of strength…
The Wolverine continued systematically testing several different elemental attacks to determine which was cheapest and most effective against the variety of mutants emerging.
