"Generally, phasmids rely on camouflage to evade predators, however, a number of species use active defences. Some species (e.g. Eurycantha) have large spines on the legs. By rapidly bringing their legs together the insects can use their spines to inflict a painful wound. Some species are also capable of making a loud, startling, hissing noise using their wings. Other species have brightly coloured wings, which they can flash to alarm predators. A number of species, such as Anisomorpha buprestoides, can produce a defensive spray capable of causing temporary blindness in humans, as well as much discomfort."
Sounds like either a ranged touch attack or a cone. Also, we may want to make its primary attacks kicks with powerful barbed hind legs. More flavorful than biting.