  We provide a holographic description of non-strange multiquark exotics as
compact topological molecules by binding heavy-light mesons to a tunneling
configuration in D8-D$\bar 8$ that is homotopic to the vacuum state with fixed
Chern-Simons number. In the tunneling process, the heavy-light mesons transmute
to fermions. Their binding is generic and arises from a trade-off between the
dipole attraction induced by the Chern-Simons term and the U(1) fermionic
repulsion. In the heavy quark limit, the open-flavor tetraquark exotics $QQ\bar
q\bar q$ and $\bar Q\bar Q qq$, emerge as bound Efimov states in a degenerate
multiplet $IJ^\pi=(00^+ , 01^+)$ with opposite intrinsic Chern-Simons numbers
$\pm \frac 12$. The hidden-flavor tetraquark exotics such as $Q\bar Q q\bar q$,
$QQ\bar Q\bar q$ and $QQ\bar Q\bar Q$ as compact topological molecules are
unbound. Other exotics are also discussed.
