Demons are dangerous fighters, both physically and magically. Their abilities (and generally form) follow from the emotion they feed upon. Most of what they have seen over the past few days are the weaker varieties, thankfully- rage, terror, and a handful of sloth. Manageable with discipline and training. Rage demons tend towards fire spells and direct attacks. Terror demons use earth magic to burrow through the ground and surprise enemies from behind whenever possible. Sloth demons are slow but powerful hitters, who try to drain your energy to prevent you from dodging their attacks. There have also been a surprising amount of wisps- demons too unfocused to properly take hold of an emotion. They attack with raw magic at range, easily deflected with a shield and easily dispersed with a hit or two, but capable of overwhelming through weight of numbers. If they do get attacked, Lionheart should hang back and let Cassandra handle them. She has the ability and training to deal with anything they are likely to encounter far from a rift.
Demons are intelligent enough to speak, though their monomaniacal focus on whatever emotion is central to them heavily distorts their thinking. They can communicate and coordinate among themselves, so be prepared when fighting. Speaking with them is- not recommended. At all. Demons can possess people, taking control of their thoughts and actions and overwriting their very being. They will promise power, or gifts, or wishes. These offers are lies. Do not believe them. Mages are more vulnerable than ordinary people but. Do not give a demon the chance to do this. Ever.