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The origin and evolution of magnetism in OB stars is far from being wellunderstood. With approximately 70 magnetic OB stars known, any new object withunusual characteristics may turn out to be a key piece of the puzzle. We reportthe detection of an exceptionally strong magnetic field in the He-strong B2IVstar CPD-62 2124. Spectropolarimetric FORS2 and HARPSpol observations wereanalysed by two independent teams and procedures, concluding on a stronglongitudinal magnetic field of approximately 5.2 kG. The quantitativecharacterisation of the stellar atmosphere yields an effective temperature of23650$\pm$250 K, a surface gravity of 3.95$\pm$0.10 dex and a surface heliumfraction of 0.35$\pm$0.02 by number. The metal composition is in agreement withthe cosmic abundance standard, except for Mg, Si and S, which are slightlynon-solar. The strong and broad ($\sim$300 km/s) disc-like emission displayedby the H$\alpha$ line suggests a centrifugal magnetosphere supported by thestrong magnetic field. Our results imply that CPD-62 2124 is an early B-typestar hosting one of the strongest magnetic fields discovered to date, and oneof the most evolved He-strong stars known, with a fractional main-sequencelifetime of approximately 0.6.

B field in OB stars (BOB): The outstandingly strong magnetic field in the evolved He-strong star CPD-62 2124