Be very careful about these-they do tons of torpor damage, I was down on the bottom of the ocean (on the island) and I saw a pack of these sea scorpions. I decided to dismount off of my mosa and kill them with my pick, as that would get more black pearls. When I got close to them one of them-a level ten hit me and knocked me out in one shot. I was level 88, wearing journeyman flak and apprentice riot. And they knocked me out in one hit. The moral of the story is that these things are very dangerous.
These things are incredibly dangerous, if you see them, flee. Especially if you're playing Ragnarok and you're at Viking Bay, where they can follow you onto land. They'll horse you and knock you out, then slowly kill you because their actual damage is so low they need to break all your armor first.