Arbalest Rogues are most at home in mid to long range encounters - preferring to utilize their keen eye and sharp intelligence to maximize the potential of wielding a crossbow. Every Rogue who masters the crossbow aims a swift, singular quarrel with a keen eye finding every weakness in their target's defenses.

As an Arbalest, you have learned to utilize crossbows to maximum effectiveness by means of stealth and ingenuity. Some crossbowmen favor repeating crossbows or learn how to quickly reload their weapon via skill or a cocking lever. Contrary to this, you have focused your abilities into making each and every bolt do its maximum potential damage. This goal is met by producing blackpowder bolts with tinker's tools which cause localized explosions on their target that easily punches through armor. Alternatively, these bolts can be used as distractions or, with the right tools, might bring down structures.

As your tinkering skills increase, you will learn to utilize blackpowder other ways such as blackpowder satchels. While challenging to craft, these tools might be expertly used in a number of creative ways. Have a talk with your DM about some custom creations you might be able to use as you rise in levels that will be unique to you!

These types of skills and materials are not easily acquired. It takes knowing the right people and being mentored...or being a singularly gifted mind and stumbling across these tinkered wonders on your own. In either case, you have the knowledge and skill to use this new found substance of blackpowder.

Quarrler

Studying the creation, function, and maintenance of the crossbow has afforded you an additional array of proficiencies.

Starting at 3rd level, you gain proficiency in the Light Crossbow, Heavy Crossbow, and Tinker's Tools. Your proficiency bonus is doubled for any ability check you make that uses Tinker's Tools.

Provided you have access to the raw materials, you may craft 10 Blackpowder bolts and perform maintenance on your crossbow as part of a short rest.

Blackpowder Bolts

Unlike other Rogues, subtlety is not necessarily your method of dealing powerful blows on a target's weakest points.

Starting at 3rd level, your Aneak Attacks do not need advantage or another enemy of the target within 5 feet of it as long as you are firing a Blackpowder bolt at your target. The small payloads of blackpowder within your bolts provide the bonus damage from Sneak Attack. However, if you do have advantage on your attack with a Blackpowder Bolt, you gain a +2 to hit against your target as your blackpowder is able to pierce through their armor more effectively than regular quarrels.

Settled Shot

Every now and then, an excellent Arbalest is able to settle their crossbow on their shoulder and aim using a method that provides no imbalance to their shots. 

Starting at 9th level, as a bonus action, you give yourself advantage on your next attack roll on the current turn. You can use this bonus action only if you haven’t moved during this turn, and after you use the bonus action, your speed is 0 until the end of the current turn.

Satchels

Starting at 13th level, you have become so proficient at tinkering with blackpowder that you are able to craft a devastating Blackpowder device hidden within a discreet satchel. Over the course of a 1-hour period, you craft a Smokepowder Satchel or Blackpowder Satchel.

Smokepowder Satchel - The Smokepowder Satchel is tiny in size. As a bonus action, you or anyone holding the satchel who knows how to operate it is able to attach it to a surface (such as a door, wall, or floor) and ignite the fuse. At the beginning of their next turn, the satchel will explode into a thick cloud of smoke that creates a 20-foot-radius sphere of a harsh grey smog. Alternatively, you may shoot the satchel with your Blackpowder Bolt to ignite it as a bonus action. The smog spreads around corners. It lasts for 1 minute or until a strong wind disperses the smog. Its area is heavily obscured. When a creature enters the area of the smoke for the first time on a turn or starts its turn there, that creature must make a Constitution saving throw. The creature takes 4d6 piercing damage on a failed save, or half as much damage on a successful one as they breath in the miniscule shrapnel filling the gaseous smog. Creatures are affected even if they hold their breath or don't need to breathe. The smog moves 10 feet away from you at the start of each of your turns, rolling along the surface of the ground. The vapors, being heavier than air, sink to the lowest level of the land, even pouring down openings.

 Blackpowder Satchel - The Blackpowder Satchel is small in size. As an action, you or anyone holding the satchel who knows how to operate it is able to attach it to a surface (such as a door, wall, or floor) and ignite the fuse. At the beginning of their next turn, the satchel will explode. Alternatively, you may shoot the satchel with your Blackpowder Bolt to ignite it as a bonus action. Each creature in a 20-foot-radius sphere centered on that point must make a Dexterity saving throw. A target takes 8d6 fire damage on a failed save, or half as much damage on a successful one. The Blackpowder Satchel deals triple this damage to structures and constructs who fail their saving throw within range. The fire spreads around corners. It ignites flammable objects in the area that aren't being worn or carried.

The save DC for both Satchels is equal to 8 + your proficiency bonus + your Intelligence modifier.

You are allowed to have two Smokepowder Satchels and one Blackpowder Satchel at any given time (at DM discretion, these numbers are liable to change).

Quarrel Sniper

17th-level Arbalest feature

After hundreds of hours of practice and combat experience, your skill and mastery have escalated exponentially. As a master of using crossbows efficiently, you have learned how to deal exceptional damage from extreme ranges. You gain the following benefits:

Deadeye - When you attack and hit a creature that is at least 100 feet away from you with a crossbow, you deal an additional 5d6 sneak attack damage.

Longshot - You double the normal and long range of any crossbow you use.