Macabate

The macabate is a tree that grows in tropical climates. It is no more than 6 feet high, but its roots extend horizontally for more than thirty feet in diameter. These must be peeled because it is their heart that is used to make a very good antipoison sold in powder form.
A little macabate decoction powder in the nose and throat gives advantage on saving throws against all Inhalation poisons, which are among the most dreadful, for 1d4 hours, and on saving throws to remove the poisoned condition and any other effects due to an Inhalation poison that was breathed in the previous hour. The subject does not, however, recover any hit points lost due to the poison.