Tā shǒu zhōng de bǎojiàn, fǎngfú dāngnián de yǐtiānjiàn.
The sword in his hand was like the legendary Heaven-Reliant Sword.
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The phrase comes from Song Yu's 《大言赋》: 长剑耿耿倚天外. Jin Yong then made 倚天剑 famous in 《倚天屠龙记》 (The Heaven Sword and Dragon Saber), one of the most-adapted wuxia novels in Chinese pop culture.
1961 wuxia novel by Jin Yong, adapted into countless TV dramas and films. The sword and saber together are said to hide a secret that can rule the martial world.