Whark

The Whark  is a symbol of fear to the people of Riven due to Gehn ritually sacrificing them to it.  The Whark is one of the twenty-five symbols on the pillars in the stone pillar room.  

Sunner

The Sunner does not seem to be worshiped by the people, but it is one of the twenty-five symbols on the pillars in the stone pillar room.

Ytram

The Ytram does not play a major part in the religion of the people, but they are caught in traps and could possibly be used for food, skins or even poison, it is one of the twenty-five symbols on the pillars in the stone pillar room.

Delta Fish

The Delta Fish is mainly used for food by the Riven people.  It is one of the twenty-five symbols on the pillars in the stone pillar room.

Golden Scarab

 There are Statues, Inkstands, Water basins, and Paintings depicting this creature throughout Riven. The Golden Scarab is one of the twenty-five symbols on the pillars in the stone pillar room.