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Magnetar is the threshold sibling of SLH-DSA in the LP-4200 unified PQCrypto block. The construction (Pedersen-VSS DKG + MPC evaluation over the WOTS+/ FORS/Merkle signing tree of FIPS 205) produces a signature byte-equal to a single-party FIPS 205 signature on the same message and group public key. The precompile dispatches to luxfi/crypto/slhdsa.VerifySignatureCtx under the hood — the verifier is interchangeable with single-party SLH-DSA. The dedicated slot 0x012207 binds the verification to "this signature came from a threshold ceremony" for on-chain code that cares about the binding, provides gas-tier separation, and reserves the slot for future non-FIPS- 205 verification paths (identifiable-abort hint, aggregated-cert envelope). Mirrors the pulsar precompile shape (threshold ML-DSA at 0x012204) and the slhdsa precompile shape (single-party SLH-DSA at 0x012203). All 12 FIPS 205 parameter sets (SHA2/SHAKE × 128/192/256 × s/f) are accepted with the same per-mode gas schedule as slhdsa. Tests pin the canonical address, exercise the per-mode gas table, reject short / unsupported-mode inputs, round-trip a valid FIPS 205 signature through the precompile, and confirm a flipped signature byte yields the 0x00 result word.