van der Waals antiferromagnets provide a route to thickness-controlled magnetic order, but few combine high-temperature Ising order with conducting, correlated, and topological electronic structure. Here we show that UOTe realizes this combination. Magnetic susceptibility reveals a strongly anisotropic paramagnetic response, while neutron diffraction establishes $c$-axis antiferromagnetic order below $T_{\mathrm{N}}\approx 150\mathrm{K}$ with an order-parameter exponent $\beta =0.14$, close to the two-dimensional Ising value. Torque magnetometry further shows that the ordered state remains well described by a uniaxial antiferromagnet below the high-field metamagnetic transition. Pulsed-field magnetization up to $73\mathrm{T}$ shows that the ordered state survives to very large fields applied along the $c$ axis before entering a broad metamagnetic regime that begins near $50\mathrm{T}$ and remains unsaturated at the highest measured field. Angle-dependent proximity detector oscillator measurements show that the metamagnetic instability is set by the field component along the ordered moment direction, providing direct evidence for Ising-like field rigidity. UOTe therefore establishes a field-rigid Ising antiferromagnet with giant metamagnetic transition fields in a compensated van der Waals metal, where high-temperature $c$-axis order, quasi-two-dimensional magnetic criticality, Kondo-associated uranium $5f$ hybridization, metallic transport, and symmetry-enabled topology coexist in a single material.

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• Antiferromagnetism
• Critical field
• Critical phenomena
• High magnetic fields
• Magnetic anisotropy
• Metamagnetism
• Phase diagrams
• 2-dimensional systems
• Actinides
• Antiferromagnets
• Layered crystals
• Strongly correlated systems
• Topological materials
• Magnetic techniques
• Neutron diffraction