Xangô is the orixá associated with thunder and lightning; one of his wives is Obá, a warrior who has only one ear. Ogum is the orixá of battle and of iron, often depicted with a machete; her companion is Oxóssi, the male orixá of the hunt and forest. Obaluaiê or Omolu is the orixá associated with disease and curing, while Osanyin is associated with leaves, herbs, and herbal knowledge. Oya is the orixá of wind and storms. Oxumaré is regarded as both male and female and is portrayed as a serpent or a rainbow. Oxum is the orixá of love, beauty, wealth and luxury, and is associated with fresh water, fish, mermaids, and butterflies. She is married to Ifa, regarded as the orixá of divination. Tempo is the orixá of time; originating in the Angola nation, he is associated with trees. Due to the link with trees, he is sometimes equated with the Ketu-Nagô orixá Loko. The orixá Exú is regarded as a trickster; he is usually honoured and fed first in any ritual. Exú guards entrances, and his ritual paraphernalia is often kept separate from that of other orixás.