Bloody Gamble is a high-stakes spell that links your life force to the fate of a single marked target. Upon casting, you designate a creature within range as your mark, initiating a perilous contest of survival between you and them. This spell embodies the essence of a dire wager, with each passing moment escalating the stakes until only one remains standing. When you cast this spell, you choose a creature within range as your mark. The marked target becomes acutely aware of the lethal game initiated, feeling the weight of the magical bond. From the moment the spell is cast and at the start of each of your turns thereafter, you suffer 7 necrotic damage as your life force is siphoned to sustain the spell. This damage cannot be reduced or negated in any way and continues until the target is slain or the spell is broken by your death. The marked target gains advantage on all attack rolls against you, their senses and reflexes unnaturally heightened by the spell's magic as it draws them inexorably towards you. Should you slay the marked target while the spell is active, the magical energy released in their demise is channeled back into you, granting you the full benefits of a long rest. This miraculous boon includes the restoration of all hit points, the recovery of expended spell slots, and the removal of any adverse conditions suffered.