Blue Dragon Scale Mail

(Requires Attunement)
While wearing this armor, your AC is 15 + Dex modifier (max 2), you have advantage on saving
throws against the Frightful Presence and breath weapons of Blue Dragons and you have resistance
to lightning damage.
Additionally, you can focus your senses as an
action to magically the closest blue dragon within
10 miles of you. This special action can't be used
again until the next dawn.