After seeing the opening of the seashell, Adam adjusted the position of the "storm ray", causing this skill to launch an attack on the soft interior of the seashell.
When shell's interior was attacked, although the HP volume was falling, the damage received was gradually decreasing.
This reduction in damage is not because the "storm ray" has become weak, but because of the passive "tenacity" of seashell's talent. This passive effect is damage reduction, and the more attacks you receive, the higher the damage reduction ratio. This is why the damage to seashells is gradually decreasing.
When Adam's "Storm Ray" entered a weak state, Adam waved his staff and voluntarily terminated this skill.
He waved his staff, and the gem on the top of the staff lit up. This also meant that Adam began to prepare the second skill. This skill is "Forbidden Curse Frost Nova".