- Nyon expresses his anger.(src)
Like many other relics from the xel'naga, the terrazine found on Bel'Shir were sacred to the Tal'darim. During the Second Great War, Raynor's Raiders were hired by Gabriel Tosh to steal some of the gas from the protoss shrines. Nyon oversaw the local Tal'darim presence and could not dissuade the terrans with threats and he refused to negotiate with the terrans; the executor ordered the faithful to evict the interlopers by force. Neither this, nor attempts to seal the shrines, were enough to prevent the Raiders from stealing enough terrazine for Tosh's plans.
Defending the Artifacts
The outbreak of the Second Great War was driven by a hunt for the components to a xel'naga device. Nyon led the Tal'darim guarding many of the component sites, and suffered a long string of defeats at the hands Raynor's Raiders as the terrans stole each in turn.
A Moebius Foundation expedition found a component in a xel'naga temple on Xil, but was destroyed by the Tal'darim before they could complete the excavation. The Raiders followed the expedition and completed the work, despite Nyon's attempt to destroy them as well. At the battle's end, the executor threatened Raynor of his day of reckoning, unnerving Raynor. The executor also identified the Raiders, and correctly predicted the terrans would attempt to steal the component on Typhon XI.
Nyon was waiting for the Raiders when the terrans arrived on Typhon XI. The executor refused to back down even with the impending supernova of the local star; he judged the sacrifice of his troops to be worth the destruction of the sacrilegious terrans. The protoss' preparations were for naught again, and the executor followed the victorious terrans in abandoning the planet.
The final component was on a derelict xel'naga worldship, and the Raiders inevitably raided it as well. The executor directly intervened aboard a powerful mothership as the terrans closed on the vault, and it was insufficient.
The mothership was destroyed and Nyon killed. Antagonistic to the end, Nyon declared the Raiders as fools and claimed his spirit would go to the xel'naga.
Nyon is never named in-game, and sub-titles refer to him as the "Tal'darim Executor." The name is derived from sources such as his official portrait.
During development, Nyon was known as "Lhassir".
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