Nil was the first one to attack the three incoming void beasts. His spell wasn't very effective against void beasts since the spikes he conjured only pierced their bodies without doing any actual damage. Unless he hit an area of the void beasts' body that was solid and susceptible to his strikes. Nil couldn't see any such areas on the two catfish, so he concentrated the shower of spikes on the shark and its jaws. However, the beast wasn't a ninth level beast for nothing. Due to the shark's agile movements, most of the spikes missed or flew through its body, leaving tiny holes that healed in seconds. The few spikes that struck the shark's jaw chipped it. Or at most managed to dislodge a tooth.
But since it took some damage, Nil's attack wasn't useless, and he kept casting his spell, sending shower after shower of Sharp Rain on the shark.
The shark slowed down slightly due to Nil's assault, and the catfish took the lead and arrived within a few meters of the island.