Grenadier

Skilled with their hands and their minds, Grenadiers are experts at problem-solving on the fly. A well-placed bomb here, a small smoke grenade there, they can do it all. Grenadiers have practiced their trade tools and enjoy the smell of blast powder in the morning. Those who follow this discipline are often considered reckless, but is it reckless if it gets the job done, Janice? Didn't see you complaining the last time my bombs took out that mind flayer at the last session, now did I?

Bombastic

3rd level Grenadier Class Feature

Starting at 3rd level, your quick thinking gives you a level head in battle. You can now use an action and create a number of grenades equal to your intelligence modifier. You can use this feature a number of times equal to your proficiency bonus. Any grenades created in this way last until you take your next long rest. These grenades are not eligible for the rogue sneak attack feature. You are considered proficient with these grenades, which have a short range of 30ft and a long range of 90ft and you add your intelligence modifier to attack rolls made with them. Hurling a grenade requires you to take the attack action and you may only throw one grenade per attack (ie extra attack allows you to toss two grenades when making an attack). These grenades have a 5ft radius sphere-shaped explosion, you must roll a separate attack and damage roll for each creature caught in the radius of the explosion. They deal damage equal to 1d6[force]+your Intelligence modifier in damage. Starting when you reach certain levels in this class the damage of your grenades increases to 2d6 at 9th level, 2d10 at 13th level, and 3d10 at 17th level. Starting at 13th level in this class, the long range of your grenades increases to 120ft.

Stealth Bomber

9th Level Grenadier class feature

Starting at 9th level, you can use an action to create three different styles of bombs in addition to the bombs created by the Bombastic class feature. You can only create three bombs in this manner and must choose between one of the three options. You can use this feature 2 times per long rest.

Rogue's Best Friend. These bombs are compact and deal less damage than your force grenades, but they're more discreet. These bombs allow you to add your sneak attack to them and have a blast that is only 5ft. These bombs have a short range of 15ft and a long range of 30ft. They deal damage equal to 10(4d4) bludgeoning damage and are considered magical for the purposes of bypassing resistances. Your sneak attack can only be applied to one creature when using these bombs.

What do you mean immune? These bombs are packed with a special powder, and on explosion, creatures hit with this grenade must succeed against a constitution saving throw or be stunned. The DC for this save is equal to (8+intelligence modifier+proficiency modifier). On a failed save, the creature becomes stunned until the end of the grenadier's next turn. This grenade has a blast of five foot and only affects the creature it hits.

Houdini? Me? Nah... These bombs are filled with a cloud of white smoke. Upon explosion, the battlefield is covered in a 20ft radius cloud of heavily obscuring smoke. This smoke can be dispersed by heavy wind or spells such as gust in 6 seconds; however, the smoke will disperse naturally after one minute. Due to your long hours of studying the inner workings of your bombs, the smoke cloud produced by this grenade is considered lightly obscuring for you.

Danger? Not on my watch...

13th level Grenadier class feature.

Starting at 13th level, you have invested many many hours into your bombs and the lethal elements that fuel them. You gain the following benefits:

• Immunity to the poisoned condition and resistance to poison damage.
• You've developed a second sense for traps and bombs and gain an additional d4 when making investigation checks to find such things. This d4 upgrades to a d6 at 17th level.
• This ability requires the use of the level 9 Creation ability. When you use the Creation ability to make smoke grenades: You've learned how to make your smoke grenades deadly. All creatures caught in the radius produced by the smoke cloud must pass a  constitution saving throw dc (8+intelligence mod+proficiency bonus) the first time they enter the cloud or when they end their turn inside of it or be poisoned and take 3d8 poison damage. They take half damage on a successful save and are not poisoned.  

From Atoms to Ashes

17th Level Grenadier Class Feature

Starting when you hit level 17 in this class, you have reached the epitome of destruction. Wizards have all their fancy spells, while you have bombs. Similar to your force grenades, these bombs are not eligible for the rogue sneak attack class feature.

Ruins? More like vapor. Once per day, you can use your action to expend a charge on this feature to create a devastating explosion. All creatures in an 80ft radius sphere must make a strength saving throw dc equal to (8+intelligence+proficiency) or take 8d8+40 force damage taking half as much on a successful save. 

Who would have guessed they could do that?  Once per long rest, now you can use an action to create two special grenades. Using a bonus action you can hurl this grenade to a point within range, 5/20ft.These grenades leave behind a healing mist; this mist allows a creature within range to recover -2d6-5 health when they breathe in the vapors in the air. This is done by ending your turn inside the 15ft radius sphere left behind. The sphere dissipates after 18 seconds or after three people have been healed in this manner.

Simple isn't in the name. You're used to seeing flashes of light, and your senses have sharpened from it; your blind sense becomes blindsight of 10ft when you hit level 17 in this class. If you reach level 20 in this class, the range of your blindsight increases to 20ft. Additionally, you have learned how to carry yourself and all those heavy bombs and gain proficiency in a medium armor type of your choice.