Daft Green

The Dact Green is a species of tree that exists in the flying islands around Merveille.

This tree releases 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 trough 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 that exists in the flying islands as well.