Daft Green

The Daft Green is a species of tree that exists in the flying archipelago Merveille.

This tree releases toxic spores that can kill both animals and people (though animals can notice it before getting infected). After being infected, the person starts to develop green skin spots. After some time, the spores spread through the victim's body (it happens faster if the victim keeps inhaling them) until it reaches the heart, and then the victim dies. The only discovered cure is a species of flower called IQ that exists in Merveille as well.

Trivia

 * The cure for the infection is "IQ" referring to a persons level of intelligence; "daft" can be used to describe someone who is foolish.
 * "Green" also refers to a person who is not well.