Overview

Thalassius is divided into two main parts: the above area with mephits, crabs, and slarghilug, and the cave system which starts with puddles and golems then transitions to the lair of the kedge.

Rare Mobs

Kraj Iurolapos

Spawns all around the zone from any level 76+ "experimental kedge". Hits for up to 1500, no info on spells used.
Drops - Broken Compass, Glowing Seaweed Amice

Muckdiver

Spawns just about anywhere outside the caves. Hits up to 1700 and casts Shadowknight spells.
Drops - Muckdiver's Eye, Muckdiver Fin Earring

Phyrael Mollotus

Spawns in the middle section of both the east and west paths, from non-experimental kedge. No fight details.
Drops - Phyrael's Belt of Coral, Phyrael's Coral Collar

Rockcrusher

Spawns all over the zone outside the caves. Hits for 1900, no info on spells.
Drops - Polished Fire Coral, Polished Ragrua Fang Ring

Wavecrasher

Spawns all over in the northern portion of the caves. Hits for 1900, no info on spells.
Drops - Cloak of Crashing Waves, Mask of Crashing Waves