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However, conventional multireference wavefunction theory faces significant computational bottlenecks for these systems, stemming from their intricate ligand environments and the necessity for large active spaces to capture strong electron correlation. To overcome these limitations, we introduce an efficient quantum embedding framework that synergistically combines density matrix embedding theory with ab\u00a0initio density matrix renormalization group Relativistic spin\u2013orbit coupling (SOC) effect is incorporated through a state-interaction procedure using the eXact two-component atomic mean-field spin\u2013orbit (X2CAMF-SO) operator. Benchmarking on representative single-ion magnets confirms that our DMET-embedded DMRG-SI approach delivers results highly consistent with all-electron calculations, while offering a clear path for systematic improvement via active space expansion. 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