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Black holes with masses below a few solar masses challenge the standard picture of stellar evolution, which does not allow their formation. In this talk, I will introduce a novel transmutation channel in which white dwarfs, under the influence of spin and dark matter accumulation, can collapse into near- and sub-solar-mass spinning black holes or even naked singularities. Depending on the stellar spin and environment, three hidden fates emerge: full collapse to a black hole, overshoot to a naked singularity (bare black holes), or stalled accretion leading to hybrid stars with an endoparasitic black hole at their core. In contrast, (spinning) neutron stars follow a one-way path—any such transmutation inevitably leads to a black hole, with no possibility of naked singularities or stalled accretion. I will discuss the theoretical framework, the role of dark matter, and the observational implications—from the missing pulsar problem to future gravitational-wave observations—highlighting how this new channel opens fresh avenues in probing compact objects and fundamental physics.