Derumaiosu, also known as the Delmaios , is a large Bird Wyvern that has only been featured in the MH Orage manga. Its body resembles that of a falcon or eagle. It forms a petrifying saliva that it can throw at enemies and has a breath that crystalizes its enemies into glass or dulls your weapons immediatly. .
- It has thin and fleshy skin on the throat area, making it its most weak spot. Huge damage is done to this area with Pierce bullets from a Bowgun .
- The materials of the Delmaios are dark and glittery .