To corrupt or undermine in morals; to destroy or lessen the effect of moral principles on; to render corrupt or untrustworthy in morals, in discipline, in courage, spirit, etc.; to weaken in spirit or efficiency.

a 2-point spell. If this spell overcomes an enemy they are demoralized (for five minutes, which applies to any spirit magic spell with duration so I won't say it any more). They cannot initiate combat, will run away if they are able, and if forced to fight by circumstances (i.e. there's nowhere to run) all of their attack skills are halved.

corrupt morally or by intemperance or sensuality; "debauch the young people with wine and women"; "Socrates was accused of corrupting young men"; "Do school counselors subvert young children?"; "corrupt the morals"

lower someone's spirits; make downhearted; "These news depressed her"; "The bad state of her child's health demoralizes her"

verb: to corrupt, undermine or destroy moral principles