Mother

The Mother is a chimera that appears to be a larger form of the Siren. Its not know if its a new strain of the siren virus. Like the alpha grim is to the normal grim or if The Mother is a new chimera form

Near the final boss battle with The Chrysalis, Grayson has to fight a Siren that is called The Mother, who is many times larger than the normal ones encountered. It uses the similar sonar attacks but also has the ability to suck the player towards it. During this special attack, if the proper button combination is not pressed, it will proceed to consume the player and throw him/her away as half eaten "fish food". Although the entire battle takes place underwater, the liquid is breathable; similar to the liquid Bouchard was kept in in Bonn. This boss shows weakness to any of the BM003's attacks.