Stormscale

Stormscale are elite warrior rogues that serve blue dragons. They bend lightning by using dragon magic, and use it to relentlessly pursue opponents. Hard to pin down, they are formidable foes who can turn the tide of battle.

Stormscale are famous for being able to fulfill multiple roles. They are feared as assassins who lock down spellcasters, or warriors who dash towards their opponents and take them by surprise. Stormscale are students of blue dragon masters, known as maekrix, who teach them a secretive form of magic at their conclaves, also known as Stormshells. Blue dragons are renowned for not only creating half dragon offspring as loyal soldiers, but moreso for treating their offspring with equal affection, both full and half dragons. They are aware of the limitations of their mortal offspring, as only a few can "ascend to dragonhood," and as such train them to fulfill different roles for their masters. Stormscale are usually half blue dragons, but many other races have been known to be "adopted" by blue dragons after they sensed their distant blue dragon lineage.

Stormscale are taught how to draw raw magic from their blue dragon heritage, granting them supernatural abilities that allow them to dispatch targets with lightning speed.

Storm Conduit

Starting at 3rd level, when you use your Sneak Attack feature, you can choose to turn the Sneak Attack damage into lightning damage. If you do so, you can also cause a Lightning Arc. Choose another creature within 30 feet of the creature you attacked and force it to make a Dexterity saving throw (DC 8 + your Constitution modifier + your proficiency bonus). On a failure, it takes lightning damage equal to your rogue level.

Starting at 9th level, creatures that take lightning damage from you can't take reactions until the end of your next turn.

Unleashed Tempest

At 3rd level, you become quick as lightning. Your speed increases by 5 feet when you aren't wearing heavy armor. This bonus to your speed increases to 10 feet at 9th level, 15 feet at 13th level, and 20 feet at 17th level.

You also gain an additional way to use your Sneak Attack; you don't need advantage on the attack roll to use your Sneak Attack against a creature if you are within 5 feet of it, you have moved at least 15 feet away from where you began the turn (through teleportation or standard movement), and you don't have disadvantage on the attack roll. All other rules for Sneak Attack still apply to you.

Stormscale Agent

Beginning at 9th level, you can flare your draconic blood to smell the magic in the air. As a bonus action, you can detect the presence and location of any magic present within 60 feet of you. If the magic was caused by a spell, you learn its school. You also learn if any such magic was active or cast within the past 10 minutes, and the location of what it affected if that target is within 60 feet of you. Once you learn its location, you keep track of it for 1 minute or until it leaves your 60 foot radius. You can use this feature a number of times equal to your Constitution modifier (minimum of 1), and you regain all expended uses when you finish a long rest.

Cloudburst

At 13th level, you can use your bonus action to briefly become lightning. You end all effects on yourself that reduce your speed (such as the grappled and restrained conditions), and then teleport to an unoccupied space you can see within 30 feet of you. You can use this feature a number of times equal to your proficiency bonus, and you regain all expended uses when you finish a long rest.

Stormscale Mastery

Starting at 17th level, when a creature fails its Dexterity saving throw against a Lightning Arc, it becomes the source of a second arc that deals half as much damage as the first (rounded down). You can only generate one additional arc per attack this way. In addition, if a creature generates a Lightning Arc and there are no other creatures within 30 feet of it that are hostile to you, you can cause the charge to rebound on that creature, dealing half as much lightning damage as the arc would have (rounded down).