Whenever they make an attack roll or saving throw now, they can roll a d4 and add to it. However, you must concentrate on the spell and casting anything else may break the concentration.
Ink sees the man snarl and lifts both paws up and suddenly roars, his claws extending and the full fey presence inside him causing his mismatched eyes to sparkle with chaotic light...
(Ink uses Fey Presence - aimed at the guy's 10' cube pls)