"Don't give up now darling, you're almost there" 

An ambiguous nightmare as her nightmares can easily cross over into dreams.

Her nightmares are the Struggle Towards the Light.

There's fear of failure, terror of being unable to reach a goal but hope is generally the overall feeling one has in these nightmares and usually she's at the end of the light waiting for dreamers to jump into her arms.

However, Dreamers will often awaken before they can reach her and treat Lukas as a reminder for what they're striving for.

Lukas, despite her nightmares not being the most powerful forms of sustenance is someone well versed in multi nightmare casting and lives off the sensation of watching someone reach their goal from the deepest pits of turmoil