Õ Ngoa believe in each tree has an angle that looks after the tree so Ngoa people must to take care of it. Apart from that they believe in Ghosts and evil that has carried weapons to kill and eat their gut. Those evils can be divided into 3 categories:
   
1. Ya are one of the spirits that looking to reborn as human again but if they can not find place to reborn. It will cause human a trouble.
2. Se-mung-Ngaud is one type of spirit that became servant by the Black magic user. It will possess other people as order. It can change people emotion to fall in love with someone as been command.
3. Badee, usually Thai people known as Prang-kran, it is animal spirit that can inhibit human depending on each spirit power. If animal with power has inhibits human it changes human behavior to animal behavior.