Before accepting the quest, Lenny had done his research on Harpies. They weren't a stong beast on their own which was why they chose to travel in groups and hunt together. But even then, with twenty of them Lenny though it wouldn't be dangerous to go on the trip.
As long as there were no signs of a crowned Harpy. The harpy was a strange beast, it was one of the very few that would jump in evolution. There weren't many when evolving could go from a basic tier beast, straight to the king tier beast.
It was a powerful enemy that was lightning fast and even with the three of them, Lenny only had little confidence in beating it.
At the Base, no one had seen the Harpy land on the ground. It was just in the sky a few seconds ago and it had already killed one of them.
An adventurer charged in with his spear and aimed for a stab but before he could even reach the Harpy, again it had already disappeared in front of their eyes.