  We propose a generalisation of the Weak Gravity Conjecture in the presence of
scalar fields. The proposal is guided by properties of extremal black holes in
${\cal N}=2$ supergravity, but can be understood more generally in terms of
forbidding towers of stable gravitationally bound states. It amounts to the
statement that there must exist a particle on which the gauge force acts more
strongly than gravity and the scalar forces combined. We also propose that the
scalar force itself should act on this particle stronger than gravity. This
implies that generically the mass of this particle decreases exponentially as a
function of the scalar field expectation value for super-Planckian variations,
which is behaviour predicted by the Refined Swampland Conjecture. In the
context of ${\cal N}=2$ supergravity the Weak Gravity Conjecture bound can be
tied to bounds on scalar field distances in field space. Guided by this, we
present a general proof that for any linear combination of moduli in any
Calabi-Yau compactification of string theory the proper field distance grows at
best logarithmically with the moduli values for super-Planckian distances.
