First seen (and eliminated) in Day 80 (day 83 in the manga).
A chimera is a monster artificially created using various monsters
Rou killed it and ate its flesh after he roasted it. He ate it along with everyone else.
The Chimera had a shape just like a Dragon Meatball.
Sown together in its huge round body are hardened dragon meat and several layers of dragon scales that are overlapping each other. It is capable of breathing a combination of 8 different [Dragon Venoms] used for torture and has 14 wings, long claws, and fangs made with magic metal, the sharpness and hardness incomparable to poorly made swords.
It had a grotesque appearance, but it was delicious roasted (to Rou).
【Wailing Wyvern’s Body】
In the Mobile Game, a Synthetic Beast (合成獣) depicted as a Lion with a Goat head on its back and a Snake's head for a tail is usually referred to as a Chimera in Greek Mythology.