How's Siren drop rate on the Blizzard dragon dungeon? Finally got Nifelheim to drop, no sight of siren yet and I don't know if I want to stress myself out over doing that dungeon again.
I got my first siren for my alt account last week on master legendary blizzard during 2x drop.
Marine goblins can be found on any water level between sea cave mercury and ocean of heaven. Run the blue dungeon which has increased drop rate. I ran ocean last weekend on my main account and managed to max skill my second siren. Sea cave mercury is mono blue cave so it's quite quick and easy to run