Ventilation Unit D-20

A magically-refilling reservoir of ooze is contained within this icosahedral helmet. Two chemicals are distilled from the ooze, piped through the tubes, and mixed together into an oxygen analogue, allowing its wearer to breathe in otherwise impossible conditions.   Breathe Easy. While wearing this helmet, you can breathe normally in any environment, and you have advantage on saving throws made against harmful gases and vapours that you inhale (such as the stinking cloud effect, inhaled poisons, and the breath weapons of some dragons, but not contact toxins like cloudkill).   Biomantic Overload. While wearing this helmet, you can use a bonus action to ingest the chemicals in it before they are combined into a gas, causing your body to go into a mutated state of enhanced adaptability for 1 minute. During this time, immediately after you take damage from any source, you gain resistance to that damage type. This resistance lasts until you take damage of another type (at which point you gain resistance to that new damage type) or until the effect ends. If you take damage of multiple types simultaneously, the damage type to which you become resistant is determined randomly (GM’s discretion). Once this property of the helmet has been used, it can’t be used again until the next dawn.