Ultimate Summoning Beast

The Ultimate Summoning Animal was a mixture of different summoning animals that inhabited the animal summoning facility. It was created to be a perfect counter towards other shinobi, being capable of using ninjutsu and genjutsu.

Background
The researchers of the facility created the creature to be the ultimate summoning. When Honoka tried to seal it, the creature started devouring the researchers and killed Honoka. The creature afterwards started absorbing the other summoning animals on the island and went into a chrysalis state.

Abilities
Having been created as a counter towards shinobi, the Ultimate Summoning Animal displays a variety of abilities. It can consume other summons in order to gain their abilities, and it's capable of using genjutsu, which it channels towards its eyes, and ninjutsu, as demonstrated with a Lightning Release attack. The creature could also flap sharp wind that was able to cut Guy's cheek.

Adventures at Sea Arc
When Might Guy is taken by bird summon, the crew sails to the island he was taken to. Aoba Yamashiro finds the ghost of Honoka there and shows him the ruined facility. Aoba finds the Ultimate Animal Summoning sleeping and reads its mind to learn more of its origins. When Guy, Yamato and Naruto find Aoba, the creature awakens and absorbs the animal summons that followed the others. The creature emerges, now out of its cocoon and attacks the Konoha shinobi with the abilities it has acquired as well as Lightning Release ninjutsu and genjutsu. Guy uses the fifth of his Eight Gates to stall the creature while Naruto prepares for Sage Mode. Guy kicks the creature into the volcano outside the lab and attempts to escape but the bird that captured Guy along with the other animal summons, prevent it from doing so. Honoka's ghost helps restrain the creature while Naruto tosses Rasenshuriken at the creature, slicing it and falls into the lava.

Trivia

 * A chimera is a mythological creature composed of the parts of multiple animals, and is also a genetic term for hybrid animals with more than one DNA pattern.