Dungeons & Dragons | Acid, Dice Set, & Gold

Mundane items and Adventuring Gear get overlooked in a lot of campaigns. At early levels they can be lifesaving and game changing, though. 25gp might seem like a lot at lower levels, but if you don't want to take up one of your Cantrip slots with Acid Splash (trust me, you probably don't) then a Vial of Acid is a lifesaver.

You'll thank me the first time you run into a Troll or break your last lock pick on a chest that won't fit in your Bag of Holding.
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As an action, you can splash the contents of this vial onto a creature within 5 feet of you or throw the vial up to 20 feet, shattering it on impact. In either case, make a ranged attack against a creature or object, treating the acid as an improvised weapon. On a hit, the target takes 2d6 acid damage.