While some want to watch the world burn, Grenadiers want to blow it up.  You must have access to the Bomb study to take this focus

Bomb Focus

At level 2, a Grenadier’s bombs use d6s instead of d4s for it’s alchemy die.

Persistant Bomb

At 2nd level, you learn how to draw out the effects of your bombs.  When you successfully hit a creature with your bomb, it deals additional damage at the beginning of that creatures next turn equal to the number of alchemy dice you have + your proficiency modifier.

Concussive Explosion

At 6th level, your bombs get even louder.  When you successfully hit a creature with your bomb, that creature plus any creatures in the splash radius must make a Strength Saving Throw or be knocked prone.

Targeted Bomb

At 10th level, you learn to make a bomb that focuses all your destructive capability into a single 5 foot area.  When you successfully hit a creature with a bomb, you may choose to forgo any splash damage to instead double all modifiers against the targeted creature.

Bigger Bomb

At level 14, your bombs get even more deadly.  Increase your alchemical die from d6s to d8s.

Mad Bomber

At 18th level, you can expend 2 alchemy point instead of 1 to create 2 bombs as a bonus action.  You also gain the ability to throw an extra bomb as part of your attack action.