Counting wildly ramified quartic extensions with prescribed discriminant and Galois closure group

Given a $2$-adic field $K$, we give formulae for the number of totally ramified quartic field extensions $L\mathrm{/}K$ with a given discriminant valuation and Galois closure group. We use these formulae to prove a refinement of Serre’s mass formula, which will have applications to the arithmetic statistics of number fields.