  We classify all non-invertible Kramers-Wannier duality defects in the $E_8$
lattice Vertex Operator Algebra (i.e. the chiral $(E_8)_1$ WZW model) coming
from $\mathbb{Z}_m$ symmetries. We illustrate how these defects are
systematically obtainable as $\mathbb{Z}_2$ twists of invariant sub-VOAs,
compute defect partition functions for small $m$, and verify our results
against other techniques. Throughout, we focus on taking a physical perspective
and highlight the important moving pieces involved in the calculations. Kac's
theorem for finite automorphisms of Lie algebras and contemporary results on
holomorphic VOAs play a role. We also provide a perspective from the point of
view of (2+1)d Topological Field Theory and provide a rigorous proof that all
corresponding Tambara-Yamagami actions on holomorphic VOAs can be obtained in
this manner. We include a list of directions for future studies.
