Based on the skill's description, it allowed Reidar to summon fishlike predators, and ten of them at that.
Reidar actually checked if there was something else, but anything else was outside his budget, unless he wanted to get lower-tiered skills, and they were much worse.
The school only lasted fifteen minutes, with a one-minute cooldown. Most of the others were worse. They lasted ten to twenty minutes, but their cooldowns stretched to five minutes or more. That wouldn't usually be a problem, since the summons stuck around for 15 minutes. But if Reidar's creatures got wiped, he'd be stuck waiting. A shorter cooldown meant he could bring them right back.
"Add the summon Razor-Gill School to the cart," Reidar said. While summoning these would allow him to tackle the sunken turbine quest, Reidar still wanted something better to fight on land.
