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Powder x-ray diffraction confirms a cubic ordered-spinel structure with space group $P4_{1}32$ or $P4_{3}32$. The inverse susceptibility $H/M$ follows Curie--Weiss behavior above 50 K with an effective magnetic moment $\\mu_{\\mathrm{eff}} = 3.124(4)\\,\\mu_{\\mathrm{B}}$ per Ni and a Weiss temperature $\\theta_{\\mathrm{W}} = -0.21(1)$ K, but deviates smoothly below about 10 K. 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Powder x-ray diffraction confirms a cubic ordered-spinel structure with space group $P4_{1}32$ or $P4_{3}32$. The inverse susceptibility $H/M$ follows Curie--Weiss behavior above 50 K with an effective magnetic moment $\\mu_{\\mathrm{eff}} = 3.124(4)\\,\\mu_{\\mathrm{B}}$ per Ni and a Weiss temperature $\\theta_{\\mathrm{W}} = -0.21(1)$ K, but deviates smoothly below about 10 K. The magnetic heat capacity $C_{\\mathr"},"claims":{"count":4,"items":[{"kind":"strongest_claim","text":"These results establish Li₂NiGe₃O₈ as a rare S = 1 single-trillium oxide with frustrated magnetic correlations. 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