Galvan

While Galvan is not presented in an encounter in The Rise of Tiamat, the dragonsoul stat block has been provided here for ease of use, with optional alterations for the Blue Dragon Mask.

Galvan has the Blue Dragon Mask.

While wearing no armor and wearing the Blue Dragon Mask, Galvan adds his Charisma bonus to his AC (included).

If Galvan deals lightning damage to a creature while wearing the Blue Dragon Mask, that creature can't take reactions until its next turn.

If Galvan fails a saving throw while wearing the Blue Dragon Mask, he can choose to succeed instead.

Galvan has advantage on saving throws against being charmed or frightened. While the dragonsoul can see a dragon or higher-ranking Cult of the Dragon cultist friendly to it, the dragonsoul ignores the effects of being charmed or frightened.

Once per turn, if Galvan makes a weapon attack with advantage on the attack roll and hits, the target takes an extra 10 (3d6) damage.

Galvan can use a bonus action to gain a flying speed of 30 feet until the end of its turn.

Galvan has advantage on an attack roll against a creature if at least one of the dragonsoul's allies is within 5 feet of the creature and the ally isn't incapacitated.

Galvan attacks twice with its shortsword.

Melee Weapon Attack: +7 to hit, reach 5 ft., one target. Hit: 6 (1d6 + 3) piercing damage plus 10 (3d6) damage of the type to which Galvan has resistance.

Ranged Spell Attack: +7 to hit, range 90 ft., one target. Hit: 27 (6d8) damage of the type to which Galvan has damage resistance.