Delvian: Delvians are a humanoid, bipedal, species, sensitive to light due to their relation to plants.. Certain levels of ultraviolent light can trigger a pleasant expirience called a "photogasm" Delvians kiss by pressing ears together. They also can share a part of their soul with someone through a process called "union" which was described by Crichton as " 10 years of acid and great sex all at once.