The Walrenk and Cerosik are a species of monsters. These enemies, resembling flippered marine mammal, are palette swaps of each other with varying levels of strength and are fought in different locations in the game. This monster line is Purple-affiliated.
When defeated, Cerosik yield 749 EXP, 199 Gold and have a 2% chance of dropping a Sacrum Crystal. They are fought throughout Glacia.
The Cerosik has above average stats compared to most of the monsters it is fought alongside in Glacia, but not nearly as much as the Dolthstra or Frost Worm; it also ties with them as the slowest monster in the area.