Jabberwocks make strange burbling noises, as they crashes through the woods. If the jabberwock is near, everyone is fully aware of its presence. Fey creatures flee when this notorious dragon arrives on the scene.
Chaos Embodied. This wild dragon is the personification of chaotic evil. It embodies violence and rage.
Achilles Heel. Jabberwocks are vulnerable to magical swords, and with some luck it can be beheaded.
Burble and Flame. Jabberwocks can blast flames from their eyes and confuse opponents with its strange sounds.
5e SRD
A jabberwock is a solitary, temperamental predator that haunts pristine forests and ancient ruins. Accurate descriptions of jabberwocks are difficult to come by, because the rare survivors of an encounter with one retain only a confused impression of its parts and not a sense of the whole. Pieced-together accounts describe it as a sinewy, dragon-like creature that can walk on its hind legs as easily as it travels on all four. Its eyes can emit fiery beams.
Once a jabberwock has chosen its target, it concentrates its attacks on that target until the victim is killed (and devoured), until the jabberwock is killed, or until the target escapes using teleportation magic or other means.
If a jabberwock is slain, another one appears 3d8 years later, materializing within a thousand miles of where the old one perished. No immature jabberwock has ever been sighted, and the creature does not appear to age.
5e Tools