Team Lakfiltrate (Team "Fusion"?)
The individual in question, Stryke, returned to the new gathering. It was clear that he was somewhat uncomfortable being around more surface-world strangers, but he was satisfied that the numbers might make the upcoming task more achievable.
He said, when everyone was gathered in the cave near the Sunlit Obelisk, "Before I was captured by the Dragon Cultists and their hired Mercenaries, I had acquired one of the Bhaalite Idols. While my companions sacrificed themselves, I threw it from the ledge into the Hydra's pool. Not only did I think that they would not risk angering the Hydra, but also, they did not see me do it. My ordeal in the prison was their attempt to interrogate me into revealing its location, otherwise, they would have killed me."
For some of those gathered, this was the first time that they became fully aware that there was a Hydra under the water of a nearby deep part of the Lake.