Jarl mask

Originally gotten by Alice in Phesoi's Realm. It is a Blue Dragon Mask. With it on you can speak draconic.
Rina traded this and the Clown ring to Drake for the Warlock Death Ring in the ShapeSmithing shop.
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Rina then got the mask back for its significance after learning the Twilight Coven Has Worries about the Jarl.
When Alice first put the mask on this is what she saw:
Alice connected to the spinning wheel. Beginning on a massive mountain. Blue and white = different sides against each other. Other colors decimate giant shovel in giant grave. She hears the boisterous voice that kin heard in the mind of the Giant Snake. Tossed the mask down the mountain. He sings 'bless this mask, accept my task, friend forever last.'"

(requires attunement)

Each dragon mask is a legendary wondrous item that reshapes to fit the face and head of a wearer attuned to it. While you are wearing any dragon mask and attuned to it, you gain the following benefits.

Damage Absorption. You have resistance against the mask's damage type. If you already have resistance to that damage type from another source, you instead have immunity to that damage type. If you already have immunity to that damage type from another source, whenever you are subjected to damage of that type, you take none of that damage and regain a number of hit points equal to half the damage dealt of that type.

Draconic Majesty. While you are wearing no armor, you can add your Charisma bonus to your Armor Class.

Dragon Breath. If you have a breath weapon that requires rest to recharge, it gains a recharge of 6.

Dragon Sight. You gain darkvision out to 60 feet, or to an additional 60 feet if you already have that sense. Once per day, you can gain blindsight out to 30 feet for 5 minutes.

Dragon Tongue. You can speak and understand Draconic. You also have advantage on any Charisma check you make against dragons that share the mask's color.

Legendary Resistance (1/Day). If you fail a saving throw, you can choose to succeed instead.

BLUE specifically
This mask of glossy azure has spikes around its edges and a ridged horn in its center. Its damage type is lightning. While you wear the mask, you gain the following benefit, in addition to those the dragon masks share.

Lingering Shock. If you deal lightning damage to a creature, it can't take reactions until its next turn.