It varies. The energy from the nightmare can manifest and create its own creature of darkness that must be defeated or purified to free the dreamer. Sometimes entering the dream itself is required and those can be more difficult. If not careful, the dreamer's psyche could be damaged.

[His brows furrow as he recalls the various incidents have appeared and he's had to deal with.]

There are warriors in my world who are better to fight directly. My specialty is in healing and purification, so I could lend help with my powers where I could.