Jabberwocky are a multi-dimensional menace that bounce between alternate dimensions with ease thanks to unique physiological adaptations. They can survive in full vacuum, are capable of converting any available energy and materials into sustenance, and have access to some Psionic powers.
They are large creatures with 2 tentacles and three limbs, with a large number of tasting and sensing fronds on what would be considered its head. It has no eyes or nose, indeed no holes of any type in its body except for a mouth, with a number of rows of sharklike teeth. The mouth leads to a metadimensional rift that transports sustenance to its internal organs(if it indeed has any).