Changing Character: Arturia Pendragon to Ahri

[Mark]

Essence Theft: Does this require concentration to maintain? How draining is this on her stamina to perform? Can this be used with other moves (when you get them)? Would the target be able to muscle their way out or throw Ahri off? How long does the Debuff last and how long is Ahri left dazed? I'm also a liiiiittle bit iffy about the word 'significant' here, though with the right downsides I'm open to suggestions.

Also the foxform is goddamn adorable. =P