The machine, when activated, creates a combustive reaction, resulting in a burst of localized heat, which drenches the user in sweat.   For the duration you are drenched in sweat, whenever you take fire damage, roll 1d10 and reduce the damage dealt by that amount. If the damage is reduced to 0, you gain 1 temporary hit point. If you reduce the damage to a negative amount, you gain 1 temporary hit point for each point of negative damage.   In addition, for the duration of the effect, you have disadvantage on all Charisma checks and saving throws.