The advantage of working in type IIB is that one has technical control over a larger variety of fluxes than in type IIA. This greater amount of freedom in dialing the fluxes might lead to the expectation that the masses of moduli are not necessarily linked to the AdS scale. We will not be able to realize this expectation, and although we will come relatively close, we view our failure as evidence that it might simply not be possible to do so. In fact, we conjecture that [*for any sequence of supersymmetric weakly coupled string vacua reaching out to the boundary of moduli space the masses of some of the moduli fields are of the order of the cosmological constant.*]{}[^2] Moduli fields emerging in compactifications of string theory to AdS or Minkowski space can be stabilized at best at strong coupling and could only be described explicitly if a weakly coupled dual conformal field theory with a large mass gap can be constructed.

Our conjecture is somewhat reminiscent of one of the general swampland conjectures of [@Ooguri] according to which boundary regions of moduli space are always signaled by the appearance of new light fields in the spectrum. This might 