[Overworld] Sirens

Mob name: Siren

Mob type: Hostile, underwater.

Description: Sirens spawn in rivers and in the ocean. They pull all creatures underwater and keep them down until they kill them or the creature drowns.
They are vampiric, feeding off of your life-force. They swim to the lowest water block within a 5 block radius (can chain) once they have the creature in their clutches.

Attacks: Pull - This does no damage but drags a creature underwater to where the Siren is. She then starts to swim down to the lowest water block.
Life steal - The siren steals life force from the creature, increasing her health (even past her normal health). Pro tip: Kill her quickly!

Drops: Black Heart - May be used as black dye or brewed for a Underwater Breathing potion. The potion would work for breathing under lava.
[Rare] Lost Soul - Makes you immune to damage for 5 half hearts of damage.

Notes: Chaining means that she can swim to the lowest water blocks 5 blocks away and then swim 5 more and so on.

They can pull the player out of boats.

That's awesome! Also, it definetly creates some underwater adventures with new danger lurking.

I'm thinking of renaming to the Nix or Nyx. What do you guys thing?