This paper approaches sallekhanā, the voluntary fast until death, as a distinctly Jain technology of the body oriented toward ontological subtraction. In Jain karma theory, bondage occurs through activity conditioned by the passions (kaṣāya), binding subtle material particles to the soul (jīva). Classical descriptions of sallekhanā as “thinning” or “scraping” articulate a terminal discipline in which the attenuation of bodily substance is aligned with the deliberate minimization of karmic accretion and the stoppage (saṃvara) and shedding (nirjarā) of existing karmas. Rather than an inertly passive withdrawal, the vow intensifies ascetic vigilance at the threshold of irreversible decline. The dying body becomes a potent final site of karmic modulation, its diminishing metabolism synchronized with the aspiration to diminish attachment. These dynamics position sallekhanā as a Jain technology of the body within a subtractive ethics, in which the fast functions as a kind of metabolic exit. In this light, death is not treated as a singular event but as a durational threshold, an extended ethical interval in which the dying body becomes the final terrain for the management of karmic entanglement. Furthermore, although the liberated soul is ultimately beyond sex, embodied existence is structured through sex differentiating karmas that render the fasting body irreducibly gendered while oriented toward transcendence of its condition. Sallekhanā reveals Jain technologies of the body as a subtractive mode of ethical embodiment in which sexed, metabolizing life is methodically contracted at the threshold of death, rendering the durational labor of dying the final and most exacting site of karmic release.