Adventurers wanted to remove the source of an invasive species. Meet at the natatorium at noon

Adventurers were hired to take out a group of super-evolved fish. They found out that there was a lab, where a group of lizard water mages were putting them into situations where they gain new creature abilities. THey discovered that there was another species trapped there(hyper-evolved humans) that wanted to be set free as well, they set the squales free, and stopped the object that was making the super violent fish