- "My skin graft is a cortosis mesh–a holdover from the days when I advised manufacturers in the field late in the Clone Wars. I can assure you, young lady–every bolt you fire against me will carry directly into your friend."
- ―Count Denetrius Vidian reveals his skin graft is cortosis mesh
Cortosis was a material that could be found on the planets Dinzo and Mokivj. Cortosis had a very high energy absorption rate and transmission coefficients, which allowed even the energy of a blaster bolt to be dissipated upon contact. It could also redirect the heat of explosions, as discovered when General Anakin Skywalker attempted to collapse the entrance of a cortosis mine, and the resulting explosion breached through Mokivj's crust. Despite these advantages, cortosis was very fragile, making it normally useless as armor, and had difficulties with prolonged energy attacks, such as those of lightning guns, which would overload the material.
During the Clone Wars, the Grysks, who used cortosis for energy management, told Count Dooku of an effective way to use cortosis against the Galactic Republic. By specially weaving cortosis fibers within a protective matrix, it was possible to create armor that was both durable and immune to blaster fire. The cortosis armor also redirected the energy of a lightsaber back into itself, causing the lightsaber to temporarily shut down upon contact. Duke Solha was placed in charge of creating B2 super battle droids equipped with the armor and, under the supervision of Darth Sidious, clone armor that could be used for Order 66. This was discovered by Padmé Amidala, Anakin Skywalker, and Thrawn, who proceeded to destroy the clone armor and sabotage the battle droids so they would overheat minutes after activating.
Also during the Clone Wars, the cyborg business analyst Count Denetrius Vidian had a cortosis mesh skin graft installed on his body. Years later, when Vidian was attacked by the Jedi-in-hiding Kanan Jarrus and the Twi'lek pilot Hera Syndulla, the Count was able to utilize the graft to conduct energy from a blaster bolt fired by Syndulla into Jarrus, who Vidian was holding at the time.
Behind the scenesEdit
Cortosis first appeared in I, Jedi, a novel by Michael A. Stackpole released in 1998 which revealed it was a lightsaber-resistant material. The material then appeared in numerous sources, which along with I, Jedi are all a part of the Star Wars Legends continuity and so not official canon. The material was then made canon when it appeared in A New Dawn, a novel by John Jackson Miller released in 2014.
- A New Dawn (First appearance)
- "The Wrong Crowd"—Star Wars Rebels Magazine
- Thrawn: Alliances
- Star Wars: Uprising (First pictured)