Mirror image only affects attacks, and blight and magic missile aren’t attacks. Mirror Image (PHB p. 260): Until the spell ends, the duplicates move with you and mimic your actions, shifting position so it’s impossible to track which image is real.
Does Mirror Image effect spells?
Area of effect spells don’t do anything to a duplicate from Mirror Image. Only attack rolls (any weapon or spell or anything that is an attack… requires a d20 roll to hit) affect mirror images. The images are illusions that always look exactly like the caster and are indistinguishable at all times.
Does Mirror Image trigger Sentinel?
No, it does not The Sentinel feat reads: When a creature within 5 feet of you makes an attack against a target other than you (and that target doesn’t have this feat), you can use your reaction to make a melee weapon attack against the attacking creature.
How good is mirror image?
Mirror Image effectively protects you from the (hopefully only occasional) attacks you might suffer in a chaotic fight, whilst keeping you around to do things like Counterspell etc.
How do you change the target of an attack in mirror image?
Each time a creature targets you with an attack during the spell’s duration, roll a d20 to determine whether the attack instead targets one of your duplicates. If you have three duplicates, you must roll a 6 or higher to change the attack’s target to a duplicate.
How does area of effect work in mirror image?
Area of effect spells don’t do anything to a duplicate from Mirror Image. Only attack rolls (any weapon or spell or anything that is an attack… requires a d20 roll to hit) affect mirror images. The images are illusions that always look exactly like the caster and are indistinguishable at all times.
Do you have to roll an 11 for mirror image?
With one duplicate, you must roll an 11 or higher. Anytime you’re targeted by an attack while mirror image is active on you, the spell can redirect the attack to one of your duplicates. The spell makes no exceptions regarding whether the attack can only target creatures.
How does magic missile affect a mirror image?
(emphases mine). Magic missile just hits the actual creature being affected by mirror image, and doesn’t affect the images at all. It’s not an attack, because no attack roll is made; it just does damage. Blight likewise ignores the images and affects the target, as it also is not an attack.
