  We argue that a new type of extremely light axion is generically present in
the type IIB part of the string theory landscape. Its mass is suppressed by the
third power of the warp factor of a strongly warped region (Klebanov-Strassler
throat), suggesting the name thraxion. Our observation is based on the generic
presence of several throats sharing the same 2-cycle. This cycle shrinks to
zero volume at the end of each throat. It is hence trivial in homology and the
corresponding $C_2$ axion is massive. However, the mass is warping-suppressed
since, if one were to cut off the strongly warped regions, a proper 2-cycle
would re-emerge. Since the kinetic term of the axion is dominated in the UV, an
even stronger, quadratic mass suppression results. Moreover, if the axion is
excited, the angular modes of the throats backreact. This gives our effective
$C_2$ axion a finite monodromy and flattens its potential even further.
Eventually, the mass turns out to scale as the third power of the warp factor.
We briefly discuss possible implications for phenomenology and potential
violations of the Weak Gravity Conjecture for axions. Moreover we identify a
mechanism for generating super-Planckian axionic field ranges which we call
drifting monodromies. However, in the examples we consider, the potential
oscillates on sub-Planckian distances in field space, preventing us from
building a natural inflation model on the basis of this idea.
