I’m running around the large room yelling “fish, fish, fish” as the clock is ticking. There’s a dog collar hugging my neck, ...

Once you reach the lever at the end, the gate ahead of you will open, and you'll see an open room on the other side of a broken bridge: this is the boss room. Use your Windstep Skill, unlocked at ...

If the flames do hit you, you'll take fire damage for a few seconds. Make a right after the flames, and you'll reach a room with a Ruin Guardian Sentinel. Defeat it, then go past the spike flame trap.