Spearfish spawn within the Polution Quest as well as along the Mycopolis coast. I understand the need for a treacherous/dangerous pursuit but these things are pretty obscenely powerful given the level range and how fast they move.
I think that's probably intended, as I've seen silverfins there, as well. After all, it's part of the dark lake.
While part of the lake, yes. They are FAR more dangerous than the boss of said quest. I understand them being at the coastline, there at least you have a chance to avoid them. That being said they do seem to have a tendency to chase folk to the transition, surprising me on a few occasions.
I've removed them.
The small mustard jellies can be run from but are game-enders as well. I like a challenge but at lvl4 they can waste you if you are not a fast swimmer. Especially in the quest. Most especially they do ranged damage underwater (which is ridiculous and stupid. If I can't fire a crossbow, they shouldn't fire at full power... They blast through water like it isn't there...) Many don't know the ooc tricks to kill them, especially noobs. And as it's a noob area, I know I would bail from the server if I was killed right off by one of them.