Railgunner (OneDnD)

A Railgunner fights with a potent and lethal hand-crafted railgun, making use of rounds that can devastate single targets. While many compare their destructive abilities to those of an artillerist, Railgunners prefer the precision and silence before unleashing a deadly, single shot.

 

Original subclass made by Rain-Junkie

Tool Proficiency

When you adopt this specialization at 3rd level, you gain proficiency with smith's tools. If you already have this tool proficiency, you gain proficiency with one other type of artisan's tools of your choice.

Railgunner Spells

Starting at 3rd level, you always have certain spells prepared after you reach particular levels in this class, as shown in the Railgunner Spells table. These spells count as artificer spells for you, but they don't count against the number of artificer spells you prepare. Because of capitalism, you have to add the spells manually. Additionally, you ignore the Melee Weapon requirement for the spells gained from this feature if you use your railgun.

Railgunner Spells

Lorentz Railgun

Beginning at 3rd level, your experiments have resulted in a deadly firearm, a Lorentz Railgun. It counts as a martial ranged weapon, but only you're proficient with it. It deals 1d12 piercing damage on a hit, and it has the ammunition, range (150/600), heavy, and two-handed properties. Once you attack with your Lorentz Railgun you can't fire it again until the start of your next turn, as it vents the heat from its last shot.

You also create an ammunition pouch for your Lorentz Railgun. As a bonus action you can conjure 10 nonmagical bullets, which appear inside the pouch. These bullets last until you use this feature again.

Your Lorentz Railgun's damage die increases when you reach certain levels in this class, at 5th level (2d12), 9th level (3d12), 13th level (4d12), and 17th level (5d12).

At the end of a long rest while you have your smith's tools with you, you can create a new Lorentz Railgun with 50gp worth of supplies, ammunition pouch, or both. If you already have a railgun or ammunition pouch from this feature and create a new one, the original breaks and stops functioning.

Adaptive Protocol

Starting at 3rd level, your tinkering has allowed you to adapt your railgun with a variety of firing modes, called protocols. You gain two Protocol options of your choice. You gain another one at 9th and 15th level, and each time you gain a new protocol, you can also replace one protocol you have with a different one.

As a bonus action, you can activate one of your protocols. Each protocol grants you a benefit while it's active, and a protocol lasts for 1 minute or until you activate a different protocol. Once you activate an adaptive protocol, you can’t activate that same protocol again until you finish a short or long rest or until you expend a spell slot of 1st level or higher.

Acidblast RGP-0751

Turning your shots into a highly corrosive payload, the Acidblast RGP-0751 eats away at anything you target with it. You can have attacks with your railgun deal acid damage, rather than piercing damage. When you damage a creature with an attack from your railgun, that creature takes an additional 3d4 acid damage at the start of their next turn.

Cryoclasm RGP-0273

Intended to disrupt faster foes, the Cyroclasm RGP-0273 provides the assurance that your foes won't be reaching you. You can have attacks with your railgun deal cold damage, rather than piercing damage. When you damage a creature with an attack from your railgun, its speed is reduced by half until the start of your next turn.

Flashfire RGP-0079

Designed to blast through tight ranks, the Flashfire RGP-0079 makes quick work of many foes. You can have attacks with your railgun deal fire damage, rather than piercing damage. When you damage a creature with an attack from your railgun, other creatures within 5 feet of your target take fire damage equal to your proficiency bonus.

Longshot RGP-3540

Calibrated for longer range engagements, the Longshot RGP-3540 ensures every bullet counts. Attacks with your railgun while this protocol is active score a critical hit on a roll of 19 or 20, and attacking with your railgun at long range doesn't impose disadvantage on your attack rolls.

Sparkstriker RGP-1774

Made to increase your gun’s energy output, the Sparkstriker RGP-1774 sends a massive surge of electricity into your target’s body. You can have attacks with your railgun deal lightning damage, rather than piercing damage. When you damage a creature with an attack from your railgun, the first time that creature willingly moves 5 feet or more before the start of your next turn, it takes 3d6 lightning damage.

Thundermonger RGP-0165

Tuned to give your shots as much force as possible, the Thundermonger RGP-0165 punches holes through enemy ranks. You can have attacks with your railgun deal thunder damage, rather than piercing damage. When you damage a creature with an attack from your railgun, you can push it up to 10 feet directly away from you.

Venomdrive RGP-57351

With the purpose of debilitating the enemy, the Venomdrive RGP-5735 blasts your target with a powerful toxin. You can have attacks with your railgun deal poison damage, rather than piercing damage. When you damage a creature with an attack from your railgun, that creature has disadvantage on the next attack roll it makes.

Wallbreaker RGP-3578

Designed for if your target is behind cover, the Wallbreaker RGP-3578 punches through even the toughest of terrain. You can have attacks with your railgun deal bludgeoning damage, rather than piercing damage. When you hit an object with an attack from your railgun, that hit is a critical hit, and nonmagical Total Cover is treated as Three-Quarters Cover.

Magnetic Acceleration

At 5th level, when you roll a 1 or 2 on a damage die for an attack you make with your railgun, you can reroll the die and must use the new roll, even if the new roll is a 1 or a 2. Additionally, while you have a protocol active, you can add your Intelligence modifier to the damage of your railgun.

Exhaust Vents

Starting at 9th level, improvements to your railgun allow you to siphon any excess heat for more practical uses. When you make an attack with your railgun, you can choose one of the following options:

• The force of the shot pushes you up to 20 feet in a direction of your choice. This movement doesn't provoke attacks of opportunity.
• A 5-foot radius sphere centered on you becomes lightly obscured until the start of your next turn. Creatures inside this sphere gain half cover from attacks originating outside the area.

You can use this feature a number of times equal to your Intelligence modifier (minimum of 1), and regain all uses when you finish a long rest. Additionally while a protocol is active, attacks you make with your railgun deal an additional 1d12 damage.

Overclock

By 15th level, you have became adept in pushing your railgun to its limits. When you activate a protocol, you can activate an additional protocol without expending an additional spell slot. You gain the benefits of both protocols. Additionally when you make an attack with your railgun while a protocol is active, you can expend one use of your Flash of Genius feature to grant a bonus to the attack roll equal to your Intelligence modifier (Minimum of 1).