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Low scale string models naturally have axion-like pseudoscalars which coupledirectly to gluons and photons (but not $W$s) at tree level. We show how theytypically get tree level masses in the presence of closed string fluxes,consistent with the axion discrete gauge symmetry, in a way akin of the axionmonodromy of string inflation and relaxion models. We discuss the possibilitythat the hints for a resonance at 750 GeV recently reported at ATLAS and CMScould correspond to such a heavy axion state (megaxion). Adjusting theproduction rate and branching ratios suggests the string scale to be of order$M_s$ ~ $7 - 10^4$ TeV, depending on the compactification geometry. If thisinterpretation was correct, one extra $Z'$ gauge boson could be produced beforereaching the string threshold at LHC and future colliders.

A Megaxion at 750 GeV as a First Hint of Low Scale String Theory